The numbers you are interested in when shopping for lights are from two scales referring to light and color. Read what I wrote about CRI and K, toward the bottom of this thread. http://boards.cannabis.com/basic-gro...hing-mean.html I would not buy any lights until you understand both abbreviations. HID lighting is best for everything except cloning, but CFL has many advantages. You could easily get away with CFL for vegging (though MH is best) and end up with a very nice yield. However you just can't beat HPS for flowering, unless you can get a shit load of 2200K CFLs.

All above abbreviations are in the thread I linked to, and you really need to understand them before shopping for lights.