Inverse Square Law, LED optics, and some data on popular LED's.

Shot in 1 take, I'll learn to edit videos soon. First I explain the inverse square law (poorly). Then I show you some different beam profiles using different lens angles and discuss advantages and disadvantages of both. I end with Lux results for some popular COBs and an XML-2 at 12" away. I use the term "goldilocks zone" for the zone of optimal light intensity in case you can't hear that. Also I forgot to talk about the driverless LED, it only gave me 5400 lux @ 12", way below any of the others and roughly equivalent to 4 XML-2's run at 3w. I'm still going to use them around the house but probably not for growing.