600watts puts out a insane amount of heat you better have really good cooling equipment as well.

the soil should be fine with about a half cup of bonemeal added to it and you have plenty of hieght
invision Reviewed by invision on . Lighting question Hey im a first timer, just got a 600watt HPS light, im only gonna b growin 1 plant at a time. av i gone abit overboard or is this gonna help the growth alot. also is a 5ft hight enough? cheers oh and for the soil, could i get away with using compost mixed wi perlite (bout 25%) and bonemeal. Rating: 5