question regarding t5 h0s

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B0ngman

Active Member
can anyone using t5 h0s give me some advice, im running in a gl 60 tent with 4 ready grow cubes sitting on a 2x2 tray with a 8 lamp t5 h0 fixture. how far above the top canopy should the light be, if i leave it anything under like 2 feet it drys the medium out quick and even being 2 feet above right now the temperature is like 10 degrees more at the top of the canopy (like 85) then at the bottom of the tent. (75)
 
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gobbly

Well-Known Member
I keep mine around 2-4" from the tops. I try to keep closer to 3", since at 2" the leaves start to curl down from it. To do this I have an oscillating fan blowing across the bulbs, and it stays under 80f 2" down.
 
wyteberrywidow

wyteberrywidow

Global
gobbly said:
I keep mine around 2-4" from the tops. I try to keep closer to 3", since at 2" the leaves start to curl down from it. To do this I have an oscillating fan blowing across the bulbs, and it stays under 80f 2" down.
Click to expand...
Sounds about right.I use them as well and this is how far i usually keep it and i use a fan as well to blow on the bulbs.I only use it to veg/clone tho.
 
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cruzer101

Well-Known Member
You didn't mention a screen. In order for those t5's to be real effective you should use a screen and tie the plants down to it and form a flat even canopy the width of the light.
 
jawbrodt

jawbrodt

Well-Known Member
^Go with 2", just to be safe. I've used T5's, and never had them burn my plants, unless they were actually touching the bulbs, but, with no fan, I'd give them at least 1". You can always bring it closer, as you get the 'feel' for the setup, and whether it's too hot by the canopy, or not.
 
jawbrodt

jawbrodt

Well-Known Member
No problem man, I couldn't just sit back and watch somebody losing most of the benefits of their killer veg light. :wink:
 
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B0ngman

Active Member
I lowered the light to about a half an inch over the tray and the plants are another 2 inches down inside the temperature at the top of the canopy is 96 degrres and rising
 
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B0ngman

Active Member
No bueno I raised it back to about 7 inches so I could get the fan in there and go to bed ill check back in the morning
 
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