I would consider dual 600 watters.... and at least 5 gal buckets.... I run my 4X $ grow tent will 9 buckets, a 600 w HPS a 200 watt cfl and 90 w LED... down the road will be dual 600 in the tent and another 6 plants under a 600 outside...
it would grow, of course, I dont think you'd get such alot of bud with only one light fo 15 plants..... I've used a 600 in 1.2 x 1.2 x 2 tent with 9.....with poor results.
I would use big tubs........ do 4...and grow em big, and maximize the yeild that way
I would consider dual 600 watters.... and at least 5 gal buckets.... I run my 4X $ grow tent will 9 buckets, a 600 w HPS a 200 watt cfl and 90 w LED... down the road will be dual 600 in the tent and another 6 plants under a 600 outside...
your 300 watt cfl are actually much lower in actual watts used and would only cover a couple of plants at the most. your 600 watt hps will cover 6 - 8 plants. you need more light for 15 plants
your 300 watt cfl are actually much lower in actual watts used and would only cover a couple of plants at the most. your 600 watt hps will cover 6 - 8 plants. you need more light for 15 plants