Steve yes you are correct that I am aware of the lumen/lux vs
ppf/ppfd, human eye vs plant. Throw in PAR too!
None of these terms seem to truly help the hobbiest grow Massonia’s,
Conophytum’s or Cannabis.

My reason for high end LED’s is light penetration.  I wanted to
replace my HPS system rated at 55000 lumens. I could have went with a
dozen T5HO fluorescent. However the LED’s at 325 watts made the most
sense to me. This was for growing in the basement.

I started with supplemental lighting last year when I saw Arnold’s
results who lives in the same state as me. Arnold indicated he used
supplemental lighting based on advice from Rimmer. Now I am a full
member of the supplemental light club. Ha ha. I need adjustable height
hangers for the lights next year.

Steve noticed my LED’s are under driven and therefore are passively
cooled. Heat kills LED’s. Stay away from fan cooled systems. The fans
last a year or two and need replacement or you kill your LED’s. Heat
is wasted energy and money.

Ken P
New Jersey, USA
Zone 7a

The past was erased, the erasure was forgotten, the lie became truth.

George Orwell, 1984 <https://www.goodreads.com/book/show/5470.1984>