Ok.. finally finished reading the posts from Sal, mother & gang on canibus.com and their grows. MM etc.. MM try #2

One thing I think is missing is an accurate measurement of output of different lighting sources. Not just output but that is part of the calculation. At the moment it seems that people are using a variety of lighting sources including LED's from god knows which company using which chipset and what encapsulation material which may reduce wavelength output of UV etc.. additionally different chipsets produce different spectrum's. That said.. for white lights an efficiency rating for photosynthetic reaction, and absorption must be calculated. Some refer to PAR but that is a term that far too many toss around. Each is unique to the manufacturer. Your light calcualtions are based I think.. on the trial and error calculations you, yourself have calculated for each light.

I think it would benefit the growing community to address these trial and error calculations by doing a study with a set parameter. Chipset etc.. etc.. although chipsets change in power they rarely change wavelength or overall efficiency. Provided you use the same chipset manufacturer and encapsulation media.

Mother's lights for the MM#1 & MM#2 were a very old type of LED from at least 2 years ago from the looks of it. Since the technology changes at such a fast pace (usually every 6 months). I will attempt to standardize some things here in my head.

At the moment we have been talking about "Blue Light" in PAL, then a period of SID (Regular Darkness), and then a mixture of near and far red in PAD.

Looking at the photosynthetic action spectrum which has been scientifically calculated by several Universities for standard hemp plants, tomatoes & hops the peaks are at roughly 440nm and 660nm respectively.

Thing is, currently the most "blue" output in the 460nm level is not produced by a "blue" LED but rather a "white" LED. For instance the 12000k Cree 1w LED produces 99lm while the 460nm produces 18lm .. now as we know that white spectrum is over a vast number of wavelengths. Now with mathematics software the volume of any point under the graph (between any wavelength span) can be calculated and then divided by total area (to give a percentage of volume compared with total output and then multiplied by the lm output of the LED. In this manner.. although white light is all spectrum the white Cree is actually still has nearly 2X the blue content output as a blue LED.

For regular growing cycle. I wonder what effect a white LED would have on these calculations?