There are a few posts on this topic - particularly in the DIY
forum. Just as an FYI
it is really easy to build these things, a few LEDS a few resistors and a cheap power pack.
See 5 LED
Moonlight posted by Yaksplat.
In that trail I posted a hand-drawn sketch of how to do this as well as the sites to get all the parts. Roughly:
5 LEDS at .45 each
1 Powerpack at about $4 (Allcorp.com)
and a few 70 ohm resistors for about .15
total cost less than $8 and far greater bluelight output then CSL.
Add a 555 circut and you can make them dimmable. With the suggested powerback you can load dozens of these LED
's. I.e. Assuming you have a long tank you can run 20 of them, one every few inches in your hood.
Just a thought, for you folks willing to DIY