Kelvin, Whats the best number

Here is info on Bulb I got from Tangster:

SPS (South Pacific Sunlight), Double-Ended

Description

Benefits:
South Pacific Sunlight (SPS) Metal Halide bulbs are designed to replicate the beautiful shimmering light of your fish and coral`s natural environment. These bulbs are specifically engineered to enhance the polyp extension, color, and growth of your corals. Unlike some other bulbs, SPS Metal Halide bulbs are manufactured with built-in igniters (starters) that allow them to be used with any type of ballast.

SPS Metal Halide bulbs are ideal for most Acroporas (SPS), Anemones, Clams, Hard Corals (LPS), Leathers, Mushrooms, Polyps, Soft Corals, and Xenia.

Available in 175 watt, 250 watt & 400 watt In your choice of:
Crisp Blue—10,000k representing 10-30 Ocean Depth Feet (ODF)
Mid Sea Blue—14,000k representing 30-60 Ocean Depth Feet (ODF)
Deep Sea Blue—20,000k representing 60-90 Ocean Depth Feet (ODF)


I have the 14K and it really is a beautiful light...tank loves it..


BTW Great job on link geek....Kelvin and Spectrum's (karma )