Lighting Question about distance and power

Indoor Growing Lighting
1

Hey all. have a question about lighting & power.

I have my LED light high up in the tent, almost at the roof of the tent. If i need to supply light to seedlings, can I keep my light that high up even if the seedlings are getting 250-300 PPFD?

Can i keep my LED high up out of the way and adjust the light dimmer to make sure the canopy is getting the correct PPFD / Lux., or will i be forced to lower the LED light 24 inches above the canopy?

Thanks

2

Both are options really. Lights light. Just takes a considerable amount of watts to reach the DLI during flowering if you keep it high.

Ppfd looks high for seedlings at that height. You want 180-230ish if you’re doing 24 hour light.

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3

Thanks, i can adjust the dimmer to lower it to 200. Waiting for the seeds to pop, then i will give them the light.

4

One advantage of LED’s over older lighting is the ability to put lights down close to canopy. This provides better illumination and penetration into the plant. I normally run my lights within 8" of the canopy top for this reason.

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5

I can try that once the seeds pop. i don’t want to get light stress/burn. As long as i can dial in the correct ppfd at 8", 12", 24" should be ok.

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6

Stick the seedlings in the corners. They will grow fine. I run fully mixed tents. Auto/photo/seedlings/clones at once. When i flip i either move younguns out and leave mature photo and auto. Or ill train the mature photo short and let younguns catch up a bit then flip. Can also seed to harvest auto and photo on 12/12. Smaller photo but bigger than you would think.

I also run pretty darn close.

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