I think 16-20 plants is pretty ambitious with only one light, regardless of wattage. If you veg for any length of time at all, the plants will take up so much room that it will be difficult to get a high enough concentration of light on each and still cover all the plants. You've got plenty of room, but not enough light for the "footprint" that # of plants will cover. Consider going with 2 600's instead. That will allow coverage of a larger area, while also allowing you to get them closer to the canopy without burning the plants, especially if they are air-cooled, which I definitely recommend. Just put them end-to-end and cool them with 1 fan, probably an 8 inch if you can swing the $ for lights with 8 inch flanges. Good luck.
senorx12562 Reviewed by senorx12562 on . 1st grow, think Ive done my hw... Hello guys, Ive been searching all kinds of forums as i plan to start my first attempt. I have an 8x10 room with 8 foot ceilings. This room also has a window. I have 8-10 weeks untill i would have to harvest, this and the fact that its my 1st try have lead me to skunk #1. The place im growing is OLD but the electricity seems pretty solid. Considering my budget Id like to run only 1 1000w hps/mh but im not sure how to set up ventilation and reflective medium (probably mylar) to Rating: 5