Understanding COB vs HID

[Olive Drab Green]

sorry i wont concede this. you're literally the only person in the thread that believes that.

You literally did the math.

 

[Olive Drab Green]

"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

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

And it does specify 5 square feet/0.465sq.m @18”. I had initially missed it.

 

[Olive Drab Green]

^^^^this

Read the post above yours.

 

[Olive Drab Green]

That's for the 2 cob fixture. I thought you had 3x single cob fixtures?

I have both.

 

[CobKits]

You literally did the math.

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.

 

[Olive Drab Green]

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.

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.

 

[Olive Drab Green]

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.

 

[Fractured but whole]

LOL.

 

[Olive Drab Green]

LOL.

 

[coolj]

f'kn hilarious !!!

the plants look gr8!!!!