its acceptable for most soft corals such as mushrooms, zoo's, star polyps, leathers (some with higher light preferences will need to be placed accordingly). Its on the low end for keeping large polyp stony (LPS) and they may have to be positioned mid to high in the tank as well and its not enough for small polyp stony. what lighting in particular are you looking at (how many bulbs and wattage per bulb)? Most common pc light fixtures are 260 watts (4-65 watt bulbs)