Building LED lights from facts, no theories

[Bubbleblower]

Yeah, thats why I say to calculate both the "theoretical" average irradiance, meaning the absolute photon emission divided by the surface area of the grow (footage) and or/ volume area
And aditionaly take measurements using a standard light meter (a 20-30$ one) and convert it to photons/m2 using an Excel sheet. This is a true, actual measurement of the light reaching leaves .

That should give very interesting -and surprising- results.

There is no differential absortion of different wavelenghts in air (when talking about 1, 2 or 3 meters as most, and mostly distance is way below 1m). .

May be I put it wrong. I noticed for example a much bigger difference in mW/m2 output relative to distance (below 1 meter) in UVB as in longer wavelengths. Also I saw this graph on page 7 which is very interesting.

Another thing is how light quality changes below canopy due the differential transmision of leaves, but I always claim to use undercanopy lighting as the most efficient one, that apart of it, largely avoids this problem.

I like the idea of intra/under canopy lighting a lot, it was next on my list.
Since no more than 15% (?) of the light penetrates through the canopy this should boost yield per m2 (I obviously like m3 better) and only little light is needed to get significant results.

Its necessary to find ways of measurent that any grower interested may do it if he has the will, having a limited equiptment, as a standard light meter.

Lux at certain distances from the bulb, both horizontal and vertical would be easy. I think many people are willing to take these measurements if they understand why that is important and how these data will be used. Everybody -on forums like these- should know where they can find and send this information.
We should get them with the program.
I will ask in a few forums that have thousands of growreports and do many tests.

Let me go further down my list.
Just check this pic and you understand the potential implications for cannabis.