Well I dunno what your electricity costs, but for me its like $0.092 for kW/h. So if you're gonna run a 1Kw HPS for 12 hours a day 30 days a month, it will add like $33 to your electric bill a month. a 400W is like...$13 a month, so an extra $20 a month for hella more lumens.
scagster Reviewed by scagster on . 400w HPS 6x5x8 grow room. Any Advice? Hey so basically im running a 400w Hps and have already built a enclosable environment that is 6 feet long x 5 feet wide x 8 feet tall. I was thinking of running a little more than half the space(5x4) for flowering because ive heard the 400 w is just not enough to power a 5x6x8 room full of plants. Also i think it would be ideal to have a 2x5 running with FL for my mother plants. Im goin to run 5 gallon grow bags with Fox Farms Ocean mix. Im using Bio-Grow, Tiger-Bloom, Root Excelurator and Rating: 5