I have a 24" Vertex Illumina for sale. It's in great condition, has been upgraded with additional modules, including: UV, Red, Green and Warm White, and comes with the wireless receiver so that it can be controlled from your computer.
This is a fantastic light and the only reason I am thinking of selling it is that it is much more than I need for my 50 gallon cube. You can control it from your computer and have complete control over every channel and will do the cycles of the moon, side to side sunrise and sunset. This light does it all. It has legs for being on top of a tank but does not come with a hanging kit. This light will grow anything without problem.
I want to get something smaller for my tank and so I figured I'd see if someone wants to buy this one.
Here is a screenshot of the program that controls it:
Here is a bunch more info about it.
Here is a link to my tank thread. There are a bunch of pictures of it.
This is the same kind of light the J&L has over their frag tank. I can send pictures of the actual unit to whoever wants. It's currently over my tank. It's in great shape, all modules work perfectly.
$500