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?
Hortibloom mega Plus 650w LED
- Thread starter highvolt
- Start date
From how far away would l get most from light? Ppf tell light total putout but what about losses due to hanging height? Etc?
Rocket Soul
Well-Known Member
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.
Southernontariogrower
Well-Known Member
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.
Rocket Soul
Well-Known Member
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.
1482/1.5 gives you something close to what you see in your grow.
There are no easy way to go from ppf to ppfd without measuring...
HortiBloom
Well-Known Member
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 US
HortiBloom
Well-Known Member
We have PPFD testing video attached in this product page, please check it out
