Yeah I was growing dwarf water lettuce in my 45 gallon long tank (48"x12"x19") using a standard 48" T8 shop light with 6500k bulbs, and every month I was clearing 90% of it out to give away locally. The stuff grows like crazy under 6500k lighting, I liked it alot so I plan to get a few of them now and start the growing/give away thing again!!!