Lighting plans for 90g include, 3- 4' long shop lights. 140w of T8 lighting and one used for the black light with the option to add 72-80 more watts. Enough, strong enough. I have two standard 32w residential bulbs, one 36w aquatic plant bulb @ 5500k, and one 40w aquatic plant bulb @ 6500k, all T8. The third fixture will house my black light and I will overdrive the ballast to dbl the wattage to 80w, that will let me add more daytime light if wanted too. All T8 except the black light. Should be good for low light tank.