I really wish this weren't necessary...
LFS_worker wrote:don't ask why this stuff is important but I guess it is. He states that My info is only good if it is fully repeatable and anyone anywhere could repeat the exact same experiment, and get similar results.
LOL, No need to ask, He correctly refers you to aspects of the [url=https://en.wikipedia.org/wiki/Scientific_method]Scientific Method.[/url]
I am not sure what you were stating wrt Glass and UV rays but According to [url=https://www.uhs.berkeley.edu/home/healthtopics/sunsafety.shtml]here.[/url]
UC Berkeley wrote:UVA vs. UVB Radiation:
* UVA rays have longer wavelengths and are recognized as a deep-penetrating radiation. Long-term exposure can damage the skin's connective tissues, leading to premature aging and playing a role in the development of skin cancer. This type of ray is used in tanning salons. UVA rays pass through window glass.
* UVB rays have shorter wavelengths and are primarily responsible for sunburn (think B=burning rays) and skin cancer. UVB rays are blocked by window glass.
My understanding of UV rays wrt plants is fairly limited but some studies have suggested that excessive UVB does lower yields in some food crops.
This is not related to our topic but does suggest that it has a role to play in plants, Google for further info. The above quote addresses if [various] UV wavelengths transmit through glass.
Ok, From here on out it is not going to be pretty... You were warned

.
...But Light quality and quantity I do know my fair share about.
If you say so...
This refers to info from the article.
I will take this to the autor of the article but there again even he/she does not cite his/her works or where they got that information.
[img]https://www.mysmilie.de/english/green/smilies/confused/5.gif[/img]...
High School Physics
The light meter is a velleman DVM1300 lightmeter.
Yes, Thank you.
By the way that model measures in
Lux not Lumens according to the [url=https://www.designnotes.com/downloads/Dvm1300GBNLFRDES.pdf]instructions[/url] where it is Officially called the 'DVM1300 - Luxmeter'. [url=https://www.designnotes.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=DVM1300&Category_Code=spm]This[/url] is it right?
[Not being mean here but as you measured 'lux' and referred to 'lumens' so frequently, I am curious] Did you:
Not notice?
Not understand the difference?
Not care?
Or an option I have left out.
Am I being presumptuous in thinking that you did not do any math to get to your numbers [From the
measured Lux to the
stated Lumens]?
I bet my presumption is safe considering that your stated daylight measurements closely match what the actual Lux #s would be.
Also a factor is that you did not post any light measurement conversions such as:
{ For our purposes; FC=Footcandle, Lux=Lux, Lumen=Lumen}
Since: 1 FC=1 Lumen/square foot,
and 1 Lux=1 Lumen/square meter,
and 1 square foot=0.0929 square meters
then;
1 Lux=0.0929 FC, and 1 FC=10.76 Lux
[Feel free to check the math] This means that 1 Lumen is equal to 10.76 Lux.
This puts your math off by
a bit I should say, Which may not seem all that relevant
but read on...
These are the statements I refer to as being absolutely incorrect .. Even up to 6 feet away from a window there is no lumen drop from 1" from the window. ( The light meter I am using at the high levels of lumens is only acurate to 1000 lumens , But for all intensive purposes the drop that is being mentioned would be fully detectable.)
50cm = 19.68503935inches . Now according to the article cited it is stating that evey 19"(being nice) the light would be halved. Now at the glass there are 44,000 lumens and at six feet away there should be appx 6,000 lumens folowing the formula that is stated halved every 50cm. This information could not be more wrong. As stated at six feet there is no lumen drop on my light meter. For the record the article is stating that a 20' skylight will have almost no light at the floor.
That
blue bit above is my favorite part,

If you
applied it to the quote it is in...It would be the
truest thing IN the quote it's in.
For the record you either purposefully misrepresent or
truly do not understand what he said in the article, The [url=https://csep10.phys.utk.edu/astr162/lect/light/intensity.html]Inverse Square Law of Physics[/url] disagrees with your assessment also
[url=https://www.starhop.com/High/SolInt-19.pdf]A student textbook explanation,[/url] Visit the [url=https://en.wikipedia.org/wiki/Inverse-square_law]Wiki page[/url] or google it for more info.
here is the window
Would it be possible to replace that
advertisement with picture of the actual window in situ? [It also causes side-scrolling which is annoying...lol.]
...But Light quality and quantity I do know my fair share about.
If you say so... Still, It helps to
actually be right when correcting someone, It helps a lot in fact.
Welcome to bonsai
ynot