a 600watt bulb needs to be 5 feet away from seedlings..
I agree with justa seed
Garden Knowm Reviewed by Garden Knowm on . lighting problem ive heard from lots of people that u need your lights close to your plants to sop them stretching, but this worrys me cos my 600w hps gives off alot of heat and i dont want to burn my plants wen they sprout........how close should i have them im a little confused.............. Rating: 5