Whats a good bulb to buy from J&L?

[George]

For technical data on many of MH bulbs, you can find them at Sanjay's database:
http://www.manhattanreefs.com/lighting
For more technical data and some color comparisons, you can check out this site:
http://cnidarianreef.com/G180/lamps.php

BTW, with a little bit of color spectrum knowledge, you can pretty much figure out what a bulb will look like with your ballast using Sanjay's site (by reading spectrum plot).
I am using a pair of XM 10KK and found them a little bit yellow so I supplement them with some blue T5 bulbs.