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Daylighting - Science topic

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I need several plugins to analyze light ,energy and CFD in sketchup software. Which plugins do you recommend?
Thanks
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I would highly suggest that you try to learn Rhinoceros in combination with Grasshopper and then you can use many open-source software which is based upon Energy Plus, Radiance etc... Try using the ladybug tools which is a grasshopper based open source platform which enables you to calculate light, energy, thermal comfort, CFD and more, and with the addition of the pollination system even lets you do the computations in the cloud, so you do not need a strong computer at your lab.
Rhinoceros has many other options also but I think this one is the best.
I hope you find this helpful.
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I'm looking for the best light source to replicate sunlight (or at least decent irradiance across ~300-700nm) that doesn't produce too much heat. Anyone have recommendations? 
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Metal Halide lamps are a good candidate to mimic the solar irradiance. You can find it out through the comparison between light spectrum.
The best way to reach a good conclusion is to compare light spectru of different artificial light sources and then decide on that. May be you come up with combining different light bulb to reach a reasonable light spectrum like solar.
Overall, Xenon is the best source to mimic the solar light indoor.
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I am doing research about daylight in homes, and I have 50 filled out questionnaires. The respondents replied on a 7-point ordinal scale how satisfied they were with the amount of daylight in their living room, kitchen and bedroom. Meaning that my dependent variable is at ordinal level. My question is whether I have to regroup the 7 outcome-categories into three groups called "Unsatisfied", "Neutral", and "Satisfied".
As explanatory variables I have
  • results from simulations of the daylight via a 3D model. Different daylight metrics.
  • age (confounder?)
  • gender (confounder?)
I will perform ordinal logistic regression to determine a possible correlation between people's satisfaction and different daylight metrics, so I can answer the question: Which daylight metrics perform better at predicting people's satisfaction with the daylight in their home?
I am not experienced with statistical methods at all, but I have read about the one in ten rule. The lowest outcome I have is that 2 persons rated their satisfaction as "2". Should I group my outcome into three groups in stead of seven?
Can you refer to relevant literature about sample size estimations and minimum number of data in different categories?
Best, Amalie
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If you want to consider the scale to be ordinal, you still can run an ANOVA-type test with the f2-LD-f2 from the nparLD R package. The advantage of such an analysis is that you also test for possible interactions, e.g. between Age and Gender. To include interactions in an ordinal logistic regression is not straightforward.
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I am writing an article on #thedress. I have read that this illusion is partially explained by daylight locus, and I do not fully understand this idea.
I know that it represents the distribution of natural light color spectrum, and that it must be influenced by latitude and season. But I do not fully understand what is represented in the x and y axis of the graphic and how these curves are obtained. Neither have I understood the role that this this concept has in #thedress perception.
Best regards.
Julio.
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Alexander Dräbenstedt would you mind answering/explaining a question I just had on an exam yesterday? I’ve looked through my notes and google and am still unsure what the correct answer was. I’ll find out next week but curious to how you’d explain this versus my professor.
Q: what color opponent cell (blue-yellow, red-green, black-white) is responsible for surface color changes from noon to sunset?
(summarized question from memory so I very well could have missed a key word/phrase here)
I feel like it is all of them? I asked 2 other students right after and we each chose a different answer! I said B/Y, someone else said B/W, and then another G/R (I think this one may be correct?)
The course is “psychobiology of perception and sensation”
Thanks!
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1-When we have concret data of illumination measurement , how to calculate the daylight factor in a large architectural space under a sunny clear sky (in summer) , located in a semi-arid region (place for worship)?
2-What is the formula for calculating the indoor lighting measurement point for a large space?
3-Under these conditions, what is the time accepted between the first and the last point IN THE SAME measuring campaign?
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Dear Amal!
First of all if you are measuring the coefficient between the exterior global illuminance and internal illuminance under clear sky you cannot call this Daylight Factor. Daylight factor is measured/calculated only under completely overcast skies. Please look it up in the standard ISOEN17037: Daylight of Buildings.
For the measurements I would suggest that you get two V(λ) calibrated lux meters, with the possibility of data logging. So one lux meter has to be placed outdoor at an unobstructed space with half hemisphere free of surroundings (i. e. top of the roof). Then the second one can be used for indoor measurements while the exterior one is simultaneosly measuring the global horizontal illuminance. Daylight is even under the most stable conditions too unstable to be measured with the same instrument outdoors and indoors.
However if you do not own such equipment, I would strongly suggest you to use advanced simulating techniques such as Climate Based Daylight Modelling where an annual approximation of indoor illuminance in relation to your location's climate can be made. Such simulations can be made using free available plugin for Rhinoceros, called Ladybug tools which uses RADIANCE and DAYSIM for accurate raytrace simulations.
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Daylight factor, D.A, UDI and so on.
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various metrics are defined in the literature, most of which are introduced in the link Dario Ambrosini provided.
The metrics you want to use is determined based on your purposes. For example:
  • for daylight distribution, early design phase(concept): DF
  • for daylight distribution, detailed design/retrofit phases: UDI(300-3000)
  • for glare rough estimation in early design phases(concept): ASE
  • for glare calculation in detailed design/retrofit phases: DGP
It can also be determined based on the local building certifications/standards.
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About Pilkington TiO2 based self-cleaning glass "Active", Pilkington promo material is explaining:
"It’s worth noting that when self-cleaning glass has been stored in a warehouse for a long period prior to installation, it may take up to seven days to become fully activated. This is because the activation of the glass occurs via a chemical reaction between UV rays from natural daylight, oxygen and the coating. After then, it will continue to work as long as it’s exposed to daylight, even in dull winter weather."
Can somebody explain, why week-long activation is necessary ? Is glass covered in factory with some kind of protective layer or dirt ? Some other ideas ?
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Hi
dear Vambola.
To understand how these glasses work, we need to be familiar with a specific type of chemical called a "photocatalyst." Photocatalysts are substances that show their catalytic properties in the presence of light (photos). This means that if these substances are exposed to light, they can increase the speed of a particular reaction without interfering with it. If the particle size of titanium dioxide is as small as a few nanometers, the substance becomes so active that it can react completely with contaminants, grease stains and organic matter (which are also present in the bacterial cell wall) on the glass and dissolve them in water and Convert carbon dioxide (CO2). This reaction reduces the adhesion of contaminant particles to the surface. On the other hand, on a very hydrophilic surface, the water spreads completely and in one layer. This uniform blue layer can disperse and bring down particles and contaminants that are poorly attached to the surface.
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Autodesk has discontinued development of the Ecotect software (for environmental analysis) since 2016. What are the best alternatives currently available in your opinion? Especially in the area of insolation and daylighting?
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Agree with the comments of Daniel Zepeda Rivas and Usama Badawy
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Hello.
I have an outdoor experiment with 2 species, 5 salinity levels and 2 light treatments (50% and 100% daylight). To produce the light treatments we used shade cloth and for practical reasons we created one large plot with no shade cloth (100%) and another with shade cloth (50%). Within each light treatment each species were combined with all salinity levels and replicated 8 times. To even out random variation from the two light plots, shade cloth and all plants were switch over approximately half way through the experiment (day 36 of toal 90 days). Initially i have analysed the data with a three way anova but i have been told that the nesting is a problem and switching over does account for this. Therefor my statistical analysis is supposedly flawed. To my understanding im not able to conduct an nested analysis as i only have 1 replicate of each light tretament. I was adviced that an GLM is more appropriate due to the design!? Can anyone shed light on why an GLM should be more appropriate? Any alternative analyses?
Please provide references to support your answer and indicate you research field(biology, economics etc...) in you answer.
Thanks in advance :)
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In simple terms, linear model, including simple or mixed, allows no replicates. Becasue linear model is used to explore the relationshps between X and Y. But ANOVA must have replicates (n>=3), becasue of comparation the variance in this anylsis.
For example, "Biotic interactions drive ecosystem responses to exotic plant invaders" published in the Science, 2020. The replicates is n=2, in this study, authors used fit linear mixed effects models to explore the 3 kinds of treatments on the traits.
Fit linear mixed effects models is a very very useful analysis, which can solve almost all problems. It has minimal requirements for the data.
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In the light of the restrictions placed on people during the Covid-19 pandemic, especially those shielding, how likely is it that old diseases such as scurvy and rickets will return? For those who have been shielding, not everyone has a garden they can go into, diminished fruit and vegetable supply, a lack of natural daylight, etc, will all have an effect, but how significant will that effect be?
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Promotion of trying to maintain a healthy lifestyle within the constraints of the COVID-19 pandemic is of the utmost importance. In the short term recommending multivitamins is perhaps the simplest approach. This may reduce the risk of severe COVID-19 and the other 'historical' diseases mentioned.
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Is Solar water desalination Operates on the daylight only? Can it operates after sunset? Can it produce pure water on the midnight for example?
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If you want to continue desalination during night then the most feasible option is hybrid system.
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Based on your experiences, how we can increase in the developing countries - like Palestine - the awareness of architects & designers toward the energy used in their design and people in their living spaces? The big problem here is they believe that using the energy efficient solutions and stratigies in their design will increase its cost.
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These two scientific contributions will allow you to form a clear idea of the possible answers to your question. I hope this information is of great use to you.
  • Methods used in social sciences that suit energy research: A literature review on qualitative methods to assess the human dimension of energy use in buildings
  • The human dimensions of energy use in buildings: A review
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In daylighting calculation, celestial hemisphere is divided with 145 sky segments with a cone opening angle of 10.15° or with continuous plane divisions.
In SVF, the sky seems to be divided neatly with same height. Because of fisheye?
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The sky division into 145 segments was initially proposed by Tregenza (1987) for daylighting purposes. Sky scanners were built based on that design, and were used for many years to accumulate data and develop empirical sky radiance models. See
and
for more details about this original method and more recent ones, which use a much higher resolution.
SVF calculation methods are varied and more or less detailed. Only the simplest ones use an annular calculation... See
Chris
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John Mardeljevic references research to justify the values used in BS EN 17037 but I am unable to locate this
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I am still trying to find the original research that came up with the lux levels stated in BS EN 17037. Everything I read starts with these figures being accepted but somewhere there must be a published paper with the data?
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I want to do a thermal inspection of an hot tube distant 8 meters from my camera .
Is there any chance that i can reach out to infrared wavelengths with some IR filters ?
What if i use the Daylight cut filter and remove the infrared cut filter from the camera ?
I have seen some products like FLIR phone converter , that display the thermal image using a phone's camera.
I'm seeking the physical technology behind it somehow if it's possible to realise
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As already answered by other experts, the CMOS detectors are sensitive in the visible band but not in the 5-10 microns IR range. You need a different detector. It
is not matter of filters.
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MFCs have been a pioneering avenue for taking microbial ability to generate energy from waste and reduce it, given the output has lower yields, will it remain forever confined to R&D labs, or will it ever see the daylight that is commercial applications?
A vision of the future, can see this becoming a way of life, for reducing waste, or some well demonstrated proof of concepts.
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Yes, especially now if you see the whole COVID-19 situation, it is a perfect example of: If we keep producing food, the way we do, we are going to get sick with something medicine cannot fix. Same applies for the fossil energy at large with climate change, and the ever increasing landscape of alternate energy is likely to prosper.
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According to Wikipedia, PMMA, also known as acrylic or acrylic glass as well as by the trade names Crylux, Plexiglas, Acrylite, Lucite, and Perspex, is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to glass.
Our studies show huge potential for usage of PMMA for daylighting applications in buildings, but it is not easy to collect reliable information about the CO2 emissions or maybe other negative consequences of this material?
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Recycling: Cast acrylic sheets are depolymerised to MMA monomer which can be reused. Acrylic was added to molton lead and the vapours captured and purified. This was done commercially in the UK by a company called Du Vergier. It was closed when similar process was opened in South Africa and offered low fees.
Injection moulding & extrusion grades contain co-polymers - methyl or butyl acrylate which make the above method unsuitable as it produced a mixed MMA/BA/MA stream. PMMA is compatible with PC and ABS and can be moulded as a blend, which helps thermoplastics recycling.
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I am searching for daylight standards to use it in my PhD thesis.
For now have found the EN standards (European standards) but in 2011.
Anyone Know a more updated standards?
Thank you
Best regards
Fatima Belok
PhD candidate
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Very late answer but may interest some readers:
EN 17037: Daylight in Buildings.
This is the new (December 2018) European standard entirely dedicated to daylight in buildings. It's divided into four parts:
  • Daylight Provision
  • Outside view
  • Exposure to sunlight
  • Protection from glare
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I am doing a research about interactive spaces in universities buildings, and I wish to measure this interaction by analyzing several variables that shape the interactive space including: visual connection, thermal comfort, daylight, furniture, circulation.
I wish to do this study by measuring these variable using Grasshopper in Rhino.
The point is that I can measure the environmental variables by ladybug but if I want to measure the non- physical variables, do you recommend any plugin?
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Here you may receive very good amswers but Grasshopper3d.com is , in my opinion, the best place to ask your question. You might want to use physical sensors, real cameras, so on and so forth. See the link below as an example. You might benefit asking people there who share similar interests.
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Hi everybody,
I have couple of questions related to measuring visual comfort metrics when you have applied a coating on a glass sample.
We coated some glass samples and then measured the optical characteristics of these glasses in terms of absorbance and transmittance spectra. Also, we already know the u-value and R-value of the base glass without coating layer.
We are planning to study the influence of these coated glasses on users’ visual comfort metrics such as daylight glare probability (DGP) and useful daylight illuminance (UDI) by using DIVA.
1-How can we convert absorbance and transmittance to parameters that Radiance can recognize for daylight simulation?
2-Is there any formula that could convert optical features (such as absorbance and transmittance) to recognizable parameters in DIVA/Radiance? I mean which type of input should we use that software provides us with the UDI and DGP.
Thank you so much in advance for your help.
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Dear Alesj, strong opinions need strong arguments. The proceedings that you link collect a lot of contributions, addressing very different aspects of lighting and daylighting. The claim that artificial lighting is "better" than daylight is not made or supported by the text, and I am pretty sure that most of the authors would strongly oppose such a simplification. I would recommend to rather take the complexity of the multiple effects of daylight and light on humans as a challenge for our scientific work, than to try to avoid it. The original question here was about modelling effects of glazing on daylight. As long as the buildings that we are spending most of our lifes in are not window-less boxes, this is a relevant question to understand effects of daylight on humans. This holds true to positive and negative effects. Best, Lars.
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I am planning to develop an IR thermal camera based surveillance bot to detect human motion in outdoor. However, I am a bit confused that if i apply the same for image processing during daytime and night, will it work for both cases?
Any information regarding this issue will be highly appreciated
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It would be a bit hard to use IR thermal based image processing during daylight since the difference between target (human) and its background will be low. Hence, strict filtering needs to be applied.
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Hi there,
I kindly ask you to provide your input on the topic of daylighting and/ or glare analysis. The survey is used for a research project I'm working on. Your email addresses won't be collected.
The survey will take 2 to 3 minutes to complete.
Here is the link to the survey
I really appreciate your help!
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Interesting survey! I expect that my answers will be different from most people, since I actually have used annual daylight and glare simulations for optimization (with DIVA for Grasshopper). I found that this is quite possible, assuming one has a powerful computer and an efficient optimization algorithm (RBFOpt, via Opossum for Grasshopper).
There is one trick that may be interesting to some: I did not actually run the annual glare in DIVA, because that really takes too long. Instead, I simulated the around 25 skies that would be relevant for annual glare, and took an average of those. The advantage of this approach is that the 25 skies are then simulated in parallel, and not sequentially. (Of course it is also less precise, but good enough to compare relative quality.)
So, from my experience, the one improvement that's necessary would be to parallelize the annual glare calculation, which is definitely possible, so this is a matter of implementation.
Hope that's helpful, and let me know the outcome of the survey!
Cheers,
Thomas
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Please reply by referring to valid scientific papers.
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Dear Aryan,
Consumption can not be zero, but if someone invented bulbs to produce and store the energy they need. And now there are such, street lighting. For a specialized search, he worked for Krasimir Velinov.
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Hi there,
I kindly ask you to provide your input on the topic of daylighting and/ or glare analysis. The survey is used for a research project I'm working on. Your email addresses won't be collected.The survey will take 2 to 3 minutes to complete.Here is the link to the survey
I really appreciate your help!
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My ratings relate mainly to daylight autonomy. Since there is still no modell for glare by daylight that really shows good significance to users perception and evaluation I do not trust in simulation of glare.
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Most humans I know report a "seasonal variation" in sleep patterns that change with "hours of daylight"? What is the mechanism in humans? Do humans and animals share a similar mechanism and pattern?
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Animals also share this type of mechanism, an this extends until plants, some flowers open only in day time. Bears invernate in cold climate. All animals obey the day/night rhythm, someones are diurnals, others noturnals. This differfence are used by hunter animals to capturate theirs preys of nocturnal sleep, reason to choise a place to sleep very protected from aggression an difficult to find.
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Hello,
Anyone know how much should be the level of daylight factor in library? based on a standards.
is it between 1.5 and 5?? and what if it is more then 5 how could I know it will cause glare or no
and DF and the SDA could be calculated monthly and annually or what?
Thank you
Best Regards
Fatima.B
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Thank you all for your replies, I really appreciate it
I have another question if someone could help me to find the answer:
how could I know when the level of illuminance is uncomfortable ?, for example for the LIBRARY the illuminance need it is 500 lux so if it is less then 500 it is non sufficient (illiminance <500 lux --> not good)  , sot it should be 500 or greater (illuminance >500lux  --> good ) but what is the limit of the lux that is good for the visual comfort ??
Best Regards
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Recently, I have gone through an article in a prestigious journal where most of the figures representing the main theme is manipulated. Do I need to provide any data from my side to claim the fraud?
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I am agreed with Subir Bandyopadhyay
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Please let me know if it fits with your journal and I will send you the abstract to double check. The paper is almost finished.
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Dear Hussam,
Magda's excellent paper was finally sent and published. By the way, I inform you that there is a new special issue, also on lighting but from a more general perspective, entitled "Lighting at the Frontiers of Sustainable Development" which could be of your interest. See the link hereunder:
Sincerely yours,
Antonio
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Plants have developed adaptations for different soil types, methods of pollination, daylight hours, temperature, altitude, competition with other plants. The list is endless, even two plants of the same species, separated by geography will have a different genetic make-up.
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I'm not sure what about the question. If you're asking about genetic variation within a specific species even in a more or less common area you're asking about the adaptive nature of species to specific areas. What we know is that there is genetic variations in all species (including humans) that will individually favour different circumstances. So as climate and other variables change, members whose genetic profile permit greater adaptiveness will thrive while those without that specific profile may not. That said, this becomes an extremely complex subject when rigorously examined, and tested. The answer here is only in the most general terms. Simply, built into all species, plant and animal, is a broad general genetic compliment and different members may better thrive (and thus reproduce) in different contexts.
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Dear friends and colleagues, We are conducting a survey on daylight in residential spaces and would very much appreciate if you had a few minutes to participate and to share it. Thank your very much in advance for your help. Best, Timur
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Done, Good luck.
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Does anyone know where I could extract via API the number of sunshine hours for the last 15 days (historic daily daylight) ?
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Thanks a lot !
When I am trying to compute evapotranspiration using the Thornwaite equation, what do I use for sunshine hours? Is it the difference between Civil Twilight, Nautical Twilight, Astronomical Twilight at sunrise and sunset, or is it the Length of Visible Light, or is it the Length of Day ?
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I need to test glare and daylighting conditions in a model that is about 3x3m and 1m high . Unfortunately my university doesn't have an artificial sun, is there other alternative methods? or does anyone know if I there are private labs that have artificial sun around Houston, Texas, or even anywhere in the US that I can use for few days?
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I like Peter Tregenza's answer. With the size of your model, even using a slide projector or similar mostly-collimated source from quite a distance will result in some diverging of the light. Rotating and tilting gives you additional leverage beyond what you will experience when you bring it outside, but of course the sun bever stopsn moving so you are limited in the number of observations/measurements you can make at a time.
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it was found that a soap solution fil with an unknown constant thickness reflects the daylight and the resulting reflection is blue with a wavelength of 475 nm. T he refractive index of the soap is 1.4. What is the thickness of the film?
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Please try to verify the equation(s) in the link.
Good luck
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during the synthesis of photocatalysts, photocatalysts were dried, filtered, washed, in that process it will be exposed to the light (daylight, the light of electric lamps in households), What effect does this have on our catalyst?
Thank you very much for helping! I'm studying about this topic, and i will do it when i study a master's degree, now I am about to graduate from a university.
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Thank you all for your answers and valuable suggestions. i will work out on it. 
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Dear All
I would like to know how much light is needed for desert , grasslands, woodland and subalpine species  in climate room. I am planning for 3*3 meter climatic room for ecophysiological purposes. Normally we use florescence light and we can use LED as well. We have air and moisture conditioning in the room.
Because for obtaining high Lux values we will face problem of high temperature and in other side, for low Lux values we will have problem in light.
Do you have any suggestion for amount of Lux or PPF?
All the best,
Mehdi
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I agree with Andrew Paul McKenzie Pegman 
regards 
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I am taking ultraviolet photos of flowers, after having had a Full Spectrum Conversion to the camera.  The Conversion was professionally done; the company removed a filter that blocked both UV and IR.  To take UV photos of flowers I am adding to the front of a camera a UV pass filter, excluding both visible and IR.  I am not sure if it matters how I set the White Balance in the camera.  I can use trials to see how the appearance of the photos varies with different White Balance settings, but if anyone has experience with this, please don't hesitate to make a suggestion as to how to set the White Balance in a digital SLR for UV photos.  Thank you
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 Personally I would experiment with a range of wb aettings. The best setting will be the one that gives you the image discrimination you seek.
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This research continues on factors influencing Indoor Environment successfully and also the effect of daylight in terms of major element.
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Dear Dr. Farah,,
Most healthcare settings, as well as other buildings, are lit by a combination of daylight entering through windows and skylights and electric-light sources. It is important to understand how these two types of light sources differ to understand their relative impacts on human health and performance. Sunlight is electromagnetic radiation in the wavelength range that can be absorbed by the photoreceptors of the eye. Sunlight provides a balanced spectrum of colors with elements in all parts of the visible wavelength range. The actual wavelengths present in daylight vary over the day with latitude, meteorological conditions, and seasons.
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How can we reduce the length of stay of patients through these 2 factors? Patients can be classified under any category but mostly "long stay patients" and their benefits.
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Dear Farzana
Daylight is still a factor affecting the state of mind of a patient. Who says beneficent light cure said said life. Should that light is not intense to avoid dazzling patients inevitably it is interesting to translucent materials
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I need a precise measuring tool to do post occupancy daylighting evaluation in an existing library.
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Lux meters of Ahlborn brand offer a good compromise accuracy / price. They require a docking station of the same brand but offer a great opportunity for mobility.