Light distance

cjf2612

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My grow chest is 30 inches tall inside.With a 400w HPS can anyone tell me how close to the light I can allow my plants to grow without getting 'burnt'
 

Brouli

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hahahah now thats a funny question
around 2 feet away from you tip of a plant.
or just let your light run or an hour then put your hand under-it and were you will not fell the heat at all!! thats the hight
 

cjf2612

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Thanks brouli, but I realy don't get it now. My grow space height is 30 inches so call me a twat if u wana but doesnt that mean I can only allow them to grow to about 6inches (12in per foot / 2ft gap leaves 6 inches ) in height to grow ?
 

Brouli

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you forgot to add the pot size :(

thats the thing man hps put a lot of heat if you put them lower you burn the leafs and then you f. i use CFL for veg stage cheaper much cheaper per month and ou can keep bul 2-3 inches above the plant
 

Brouli

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but how are you going to flower in 30 inch grow space unless you are growing LOWRYDER ??
 

ZMAN

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besides the space 2ft is horrible for a 400w. with decent supplies it can be brought with in 6-12 inches.
my 400 is never more then 12 inches away.
 

Growdude

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ZMAN said:
besides the space 2ft is horrible for a 400w. with decent supplies it can be brought with in 6-12 inches.
my 400 is never more then 12 inches away.
I agree I allways have it within 18 " with a non vented hood.

Use the hand method, but as long as its not Hot on your hand its ok.
 
D

DLtoker

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Def. need an inlined cooled light for that to work... then you can keep them as close as a couple inches from your plant.
 

Dr.GreenThumb

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Growdude said:
Use the hand method, but as long as its not Hot on your hand its ok.
If you can keep the back of your hand there for about a min that is what the plant is going to feel...if its really warm 95+ degrees move the light up. Thats about the best you can do. You have to keep your temps under control or its going to be ****.
 

Dr.GreenThumb

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DLtoker said:
Def. need an inlined cooled light for that to work... then you can keep them as close as a couple inches from your plant.
Even with a inline fan I think that would be way to close.
 
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use co2 if your worried about temp.... you can grow up to 95 degrees that way. cheapest way to do it is to buy a paintball tank and remote on ebay, and spray it in. good luck
 

sweetnug

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That space will not work for a 400. Someone just had a ? like that earlier, and we all thought about 4 ft. minimum, I think 6 but not 2.5 ft. Maybe a T5 flo
 

berserker

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cjf2612 said:
My grow chest is 30 inches tall inside.With a 400w HPS can anyone tell me how close to the light I can allow my plants to grow without getting 'burnt'
Here is a chart for you to look at for a unvented hood.Hope this helps,and keep it GREEN:hubba:

HPS CHART.jpg
 

sweetnug

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Great chart man. That is a good guide for beginners and pros. :) :)
 

audix2359

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With that small of a space you should check out CFL's or even better, some LED lights.
 

mastersativa

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Anyone notice the date of the last post he left in this thread? lol.
 

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