Purchased my first metal halide retro today. It's a 250w setup and I borrowed a bulb from the store until I figure out what I want to run. I'm leaning toward the 10k venture as I will not be using supplemental light. This is going on a 20 gallon tank so there's not enough room for flourescents. They have 400w venture 10k's on there sps tank and it has great color. Before I spend around $100 on a light bulb, which I never thought I'd do, give me some opinions...later