Southernontariogrower
Well-Known Member
What is usable ppfd? Says ppf 1911
From how far away would l get most from light? Ppf tell light total putout but what about losses due to hanging height? Etc?
What is usable ppfd? Says ppf 1911
Ppf is raw efficiency, how much par in total. Ppfd is a spot measurement and depends on area, how high you hang it etc. 1911 ppf over a meter would give 1911 ppfd, if you assume perfect reflectivity.What is usable ppfd? Says ppf 1911
From how far away would l get most from light? Ppf tell light total putout but what about losses due to hanging height? Etc?
So no losses, from hanging height? I get the terminology my light is 1482 ppf which gives me about 1080 useable ppfd. Yes d for density. Or am l wrong? Per meter 2s ? So there are losses.Ppf is raw efficiency, how much par in total. Ppfd is a spot measurement and depends on area, how high you hang it etc. 1911 ppf over a meter would give 1911 ppfd, if you assume perfect reflectivity.
Ppfd = ppf / area - losses. Of course there is always some losses, that's why I said theoretical perfect reflectivity in the tent. What's your space, 4x4? A 4x4 is approx 1.5m2.So no losses, from hanging height? I get the terminology my light is 1482 ppf which gives me about 1080 useable ppfd. Yes d for density. Or am l wrong? Per meter 2s ? So there are losses.
Thanks for your order, yes, we have stock for sample order, and our shipment will arrive in US warehouse next week, then we can ship sample order from USJumping in the discussion :
Just bought from Kristy on alibaba 4 x 650 mega plus
She assured me its all 301h + osram 660nm
In 3 days lamps were ready to ship ..
So Sanmenxia should have the chips in stock .... correct ?