Been running three 14K Hamiltons over a 180, and was wondering what the rest of the 400W world was using. No supplemental lighting, by the way. Seems like my choices are 12K Reeflux, 14K Coralvue, Hamilton, Ushio, 15K XM, 20K Coralvue, Radium, Reeflux, Ushio, XM. Let's hear what You like.