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Normanite420 started grow question 4 years ago
I have these plants 24 inches under a “1500w” cob led light. I have a second one to add. When should I add it?

Thanks for your advice
Week 3
Techniques. Defoliation
KilgoreTrout answered grow question 4 years ago
It’s safe to turn on all your lights at this point. Do this: start at low power if you can and slide it up over the period of a few days. Slow subtle changes are always best. Nothing good happens quickly with plants, only bad stuff.

Once at full power slide your lights lower 1” per day until you see signs of stress. It’ll be one of three things.

1. The leaves praying to the lights(upturned tips)

2. Leaf edges curling up

3. Top leaves yellowing.

Once you see any sign of any of that back them up an inch. Now you’re in the sweet spot for this strain. Measure the distance and try to keep your lights in that range as the plants grow.
Removed answered grow question 4 years ago
That really depends on how much space you have and if those 1500 watts are true watts or equivalent. With COB led lights, you start getting diminishing returns when going over 40 true watts per sq ft. Second, before adding more light I would try to get the light closer, 24 inches distance means that you loose quite a bit of intensity.