Hey, Glutek, im glad my Bulb Analyzer tool is useful for you.

Im too interested on qualitative and no quantitative effects of light quality. But the problem is this topic is way more specie dependent than light productivity. And effect are very often not linear, but modulated, and it mean lots of experimentation to be able to get any valid conclusion. Very similar experiments have different results

For example, about blue requeriments for healthy growing, it strongly depends of the plant specie considered. There are some than requires a relatively high percentage of blue light, and there is some than not require blue at all, as wheat.

About cannabis, there is little scientific data about. Most i know is for my personal experience, and is very difficult any not controlled experience proves anything. We know that cannabis requires little blue because it has been grown sucessfully using HPSs emiting very little of it. I want to try to grow cannabis only under red light and see what happens. I really suspect that cannabis not strictly require blue to grow healthy. Ive read of cannabis grown under LPS lamps, so under a absolute lack of blue, sucessfully. But ive never seen it.

What ive noticed is cannabis is a little demanding specie in terms of light quality. It thrive under almost any type of light, and its basically a photon's whore as wheat. At to what point it need a given amount of each waveband, i still dont know, but for sure is little.

Of course, not requiring not mean cannabis wont benefit for using more complete spectrums.