During a recent trip to Home Depot, I looked through the LED bulbs seeking a new refugium bulb to use on the frag system's fuge. I found this one rated 5000 Kelvin, and the shape of the bulb looks promising. The bulb cost $14 and uses 8 watts.
Rinsing out used sand saves money, and you can safely put that clean sand in your next tank without concern. It's a good project to tackle in the warmer months, best done outdoors. Easy, sort of.
More reading here: http://www.reefaddicts.com/entry.php/28952-Rinsing-used-sand-for-the-new-setup
For many years, I've used foam sheets from Hobby Lobby (most hobby craft stores have these) to keep the refugium light off the rest of my gear. People often think they need colored or black acrylic in their sumps to avoid algae growth in other compartments and within their skimmer / reactors. However, that's really not the case. While we can see light in the other zones, what happens initially is the light bounces off the acrylic baffle and goes back into the refugium zone.
And as the macro algae grows and fills the zone, even that is obscured.