I recently put two 15W, 18", 18000K Aqua-Glo bulbs over my 55, and while the spectrum is great and makes everything look beautiful they seemed a little dim. So today I added a socket for a secondary 10W aquarium compact fluorescent in each hood. I don't have any pics unfortunately, but it was a simple mod. I had to cut away some of the inner plastic bulb housing to make room for the bulbs, and then just added $1.59 sockets from Home Depot to each one. I think I can squeeze two of the CF bulbs in there if I cut a bit more material out and move the transformer from where it's currently attached. I'm also working on adding LED moon lights (horray for $0.75 leftover Christmas lights!), I just need to figure out the correct resistance I need for each strand.