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Simple t8 light fixture how far away?

How far away should my two t8 light fixture be from my plants? I have 12 pepper plants in solo cups under it, how far away from the tops of the plants is optimum for my cheap setup?
 
Yes ...I just ride mine a few inches off the plants.
 
This should be posted in "Grow Tech where:
 
Discuss lights, heaters, irrigation systems, greenhouses, and DIY solutions. Show off your inventions!
 
+1 to a few inches.. I had my seedlings grrow up into the reflector around the bulbs for a while there ..  I uses 4x 6500k T8's per row and had a 16 / 8 light/dark rotation
 
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