how far should the 400W HPS Light be from the tops of the plants from day 2 til harvest? thanks
when they are seedlings , 3 feet away from tops.
i have a aircooled reflector and burned the shit out of my seedlings by putting the 400 mh light about 14" away
i have it at 3 feet now and they are better
i guess when the plant gets bigger you can start putting it 12" away