Okay, the thread is help with lighting so I figure no thread hacking here, good a place as any. Please excuse my apparent thick headed Ness. Probably is age or IQ related, or the fact that I can't get Bb ex-friend's picture out of my brain.

Think I have a partial handle on indecency, I mean efficiency, hot ballast, dirty bulbs, dirty covers on hoods, even the hole for the cooling tube is like a spot light on the wall!!

And realize I was always going after lumens, here is the first place I've heard of PAR, what is it? Percentage of absorbed radiation(a quess). From you graph it appears that chlorophyll a&b get their power at a band~410-460 and another boost at a band~650-680. So we want to max these and not waste energy on others. Which is why leds look like their made of colored lights? Instead of going with a full spectrum?

Next questions deal with your focused our lenses light. This means down instead of all around? But your still getting coverage, based on you inverse square law. Being cooler you can run closer? Till you have a bunch of focused points and not real coverage?

Morphology, penetration, proximity, my mind is wandering again, curse you Bb!! What did you do, leave the gate open.