Understanding COB vs HID

CobKits said:
"if" if does, yes of course you can. give or take depending on efficiency you need about 100 cob watts to apply 900 ppfd to a 18x18 area, and consequently ~300W of cobs to apply 900 ppfd to a 54"' x 18" area
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CobKits said:
going back to the timber link you posted, with all due respect to dan/timber, listing "1013 ppfd" as a spec of the light is completely meaningless. assuming the 466 umol/s PPF figure is indeed accurate, to apply 1013 ppfd to an area you need to control that area to a size of 466/1013 = 0.46 sq. meter = 4.95 sq ft = 27" x 27"

PPFD vs PPF can indeed be confusing
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And it does specify 5 square feet/0.465sq.m @18”. I had initially missed it.
 
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CobKits said:
math = factual
your conclusion that the math i presented supports the premise of your original post= false logic

i dont have time to go round and round with someone who cannot admit they were wrong, sorry.
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I’m not saying my original post is accurate, just that my PPFD is correct. I was off a factor with my original post. But electroluminescence does explain the efficiency difference, even if it isn’t as much as I originally had said.
 
Look, I already said I have no problem admitting I was wrong, but you also did essentially prove part of what I said to be right. I’m just saying. It’s here on this thread.
 
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