when I used a 250, I had a heat shield but my area wasnt amazingly ventilated. I kept it 8 inches away and the plants were fine
amstron Reviewed by amstron on . hps 250 distance? how far above the plants would a 250w hps need to be?. It is quite a cold area, about 18 degrees celcius which is about 65 degrees farenheit. I have just changed from fluoros and cfls to hps. anyone know? Rating: 5