PCs good for actinics?

[no_bs]

Anything is possible. Retro with 2', they have the most par. I contemplated doing it to my 6', but then i found the URI Bulbs which are pretty good IMO. Way cheaper, way more light output, and a few more color choices than the coralife's. For the coast comparison it was still cheaper to stick to the PC's, not as may color choices.

[DAVE]

If you are only looking to supplement the MH light with actinics then I would just stick with using PC's. They are still great bulbs, just be sure you change them out regularly.

[ScubaSteve]

PCs are actually pretty good despite the bad rap they have. I actually use high power PCs in my research that are waaaay more powerful than most T5s (for the same size bulb). Just get a good PC bulb and you're set. I recommend the UVL bulbs from BRS. They're super strong. They actually made some if my SPS bleach when I made the switch (and I have even reduced the time in them!)