Lighting question - mol/m 2 /d

muleface

Well-Known Member
So I want to really nail down my lighting needs. I'm looking for a meter to give me read out on lighting so I can accurately tell when I hit 17 mol/m 2 /d.

As a side question, what would be an appropriate down time for plants? If i was to hit this mark at some point in a 24 hour period, say 12 hours, would a 12 hour down time be correct, or would less time be more efficient?

say 12 hours on, 6 off then 12 back on. There will be no sunlight hitting the plants.
 

BM9AGS

Well-Known Member
So I want to really nail down my lighting needs. I'm looking for a meter to give me read out on lighting so I can accurately tell when I hit 17 mol/m 2 /d.

As a side question, what would be an appropriate down time for plants? If i was to hit this mark at some point in a 24 hour period, say 12 hours, would a 12 hour down time be correct, or would less time be more efficient?

say 12 hours on, 6 off then 12 back on. There will be no sunlight hitting the plants.
You're over thinking DLI.

Just stick to 18/6 for veg and 12/12 for flower. Or 11 on 13 off for flower if you want to get really crafty.
 

Greengenes707

Well-Known Member
A quantum sensor, aka "par meter" is what you are looking for. For general gardening purposes, the most basic ones will work just fine.

Once you have a meter that reads in µmols/second/m2, you can convert it to mols/day...DLI
(Meter reading) x 3600 x (hours on/day)...÷ 1,000,000 = DLI

18/6 for vegetative growth...12/12 for flowering

~400µmols for 12hrs = ~17mols DLI
~275mols for 18hrs = ~17mols DLI
 
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