Sps

[michika]

I'd say your probably okay to start with something harder and move on up gradually. I keep my SPS under 175w in an 18" deep tank, and they are doing quite well. I admit it takes a bit longer for color to recover, but so far I'm pleased with my 175w.

[DanG]

just don't go with too high of a k bulb, try to stay arount 10,000k as they will have a higher par output than a 20,000k bulb. get some decent actinic bulbs and you should be good. 39w leads me to believe they're T5's and if so, URI and ATI both make great HO T5 actinic bulbs.