Hortibloom mega Plus 650w LED

Rocket Soul

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?
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
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.
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
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.
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
Jumping 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 ?
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
 
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