depends on the strain, bulb manufacture, bulb age, watts, hood projection. I start at 4ft+ when seedlings. Then adjust acording to light burn yellowing or any stresses.
Buoy13 Reviewed by Buoy13 on . 8 bulb t5 light...how close do you keep it to YOUR plants? I have a 454 watt hydrofarms t5 light fixture and was wanting to know how close to keep it to my plants. I know the hold your hand rule...I am trying to diagnose a on going problem with a grow cabnet. Thanks everyone:thumbsup: Bud Rating: 5