Light height of HPS bulb?

BtomBOMBS

Member
In the flowering stage, how high should i keep my light over the plants (got 3 headband plants)? Im using a 400 watt hps bulb in an air cooled hood.
 

slonez47

Active Member
Close as you can without any adverse effects on your plants. Take the heat test. If it's too hot for your hand, then it's too hot basically
 
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