I have hung my 400w HPS 2 feet above the tops and adjust as the plant gets bigger, but I also have a carbon filter and fan. My temps are around 80 in a 3x3x7. Fan and filter are canfan's.
Newb1stTime Reviewed by Newb1stTime on . HPS LAMPS I have a 400 watt hps lamp and wondered what is the ideal distance between the top of the plants to the lamp ? I cannot get my lamp very close to my plants as they curl upwars and i posted this on here and LIP said this was because of the heat. I don't want the plants to stretch so if anyone knows the ideal distance that would be much appreciated. Cheers Bob Rating: 5