No they will just replace the actinic lighting, Ill be using way less electricity and wont have to replace bulbs. Itll cost about 200-250 bucks to make the switch and Ill be able to reuse the Icecap 660 on the 90 gallon when I get it ready to go. The differece in how the corals flouresce is like night and day. You'll see when I post some pics. Money well spent IMO...and Janell requested them so with all of the cash Ive dropped so far in the hobby keeping her happy is high on the priority list.