dtracy11191978
Well-Known Member
Is there a correct PPFD the plants should get? I'm in week 5 of flower and PPFD is about 1200. Is it a waste to run lights at this intensity?
PPFD
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VincenzioVonHook
Well-Known Member
That's perfectly fine. Full sunlight is around 1700-2000umol as a reference. I usually run around 500-700umol/s in veg and around 1200 flowering. I've heard Efficiency drops off over roughly 1000-1200 if not using supplemental CO2, something to keep in mind..
Assuming you are growing photos. Autos can get the same DLI (around 50) at 750umol over 18hrs, or 600 over 24 hours.
Assuming you are growing photos. Autos can get the same DLI (around 50) at 750umol over 18hrs, or 600 over 24 hours.
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VincenzioVonHook
Well-Known Member
If you want good Info on lighting, this is worth a watch. Dr Bruce bugbee always has good Info.
LeastExpectedGrower
Well-Known Member
Look at DLI (Calculation of PPFD across the amount of light per day). There's a bunch of charts out there and also the Photone website has a DLI Calculator that's worth playing with that will tell you if you're over/under and how to adjust.
MisterKister
Well-Known Member
There's also the tent buddy app that calculates dli and ppfd
Troutguide
Active Member
Not a waste as long as you have CO2 and balance the rest of the system. Anything over 800 ppfd is a waste without CO2