i always get my stuff from hydro stores so i cant help you there. but i guess it depends on how big you want to grow your plants they say a 600 watt is good for a 4x4 area. id say around 6 plants would be good
i really like the neatness of your plants and how you get them to stay the same height. I thought about doing this same setup but i wasnt sure how often to flood and any issues with algea?