This retro Fit Kit comes with the 175w 10000k bulb.

Aquarium Light, actinic, 450 nm, blue color, deeper penetration, good for reef tanks, refugiums, aquariums, corals, saltwater, high intensity light. Penetrates deeper than white light. The 450 nm is a brighter blue than the 420 nm. Peaks up to 460 nm. Ins

4 wire, straight pin socket. Ready to install.