the way i use to tell if the lights are too close is by lowering the lights as close as possible to the plants and i then put my hand directly above the plants and if it feals too hot to keep it there, then the lights are to close. Its a good idea to do this every day or so and make the neccesary adjustments.
rysk8er420 Reviewed by rysk8er420 on . Effective range for 150w and 250w hps? What are the distances plants should be from 150w and 250w hps lights? Rating: 5