refugeium lighting

[Davidfrances]

I have a 40 gallon sump in my 120 reef. I'm thinking of stocking the sump with either xenia or tridacna, and was wondering what type of lighting to use in the sump. I'd like to rule out MH, the heat build up in the cabinet would max out my chiller and fan. Also the main tank is lit with 2x175w and 1x 250w MH. Would PC bulbs work, and if so does anyone have any recommendations?

 

[WarOrks15]

why would you want corals in the refugeium? most people put algae in it . but pc would be fine to have the xenia growing in it.