yup very true hps would be your best bet but... if your growing in a confined area or dont have proper ventilation, you can grow decent buds yoiu best bet is to flower early. if your using good genetics you'll want to flower a few weeks into veg depending on your strain. bag seed maybe a bit longer. I personally use a 4 foot 4 tube t5 with a set of blue for veg/red for flower. and during flowering I add a couple of 42 watt CFL's and have recently added another 4 foot 4 tube t12 (regular size) flouros and depending on my size, strain, i flower 4-8 plants in a 2x4x8 closet with a box fan on top on low all day to keep th temp around 75-80 and a small 4 inch circular fan hung on one side of the flouros just to blow the heat around under the lights so there isn't a hot spot. my set up is very basic any novice grower can come out with 3-4 oz on 4 plants their first time gaurenteed if not more (depending on genetics). any questions you may have feel free to ask i have a great knowladge base on very ceahp ways to grow w/ flouro set up/ soil or hydro.