I just bought this light for my 20 gallon tank and it's great!
The bulb that it comes with is 1/2 10000K (I think) and 1/2 actinic, so you may want to replace it. I literally see new plant growth every day even with the 1/2 actinic bulb. I put the light directly on to the glass hood, but it does come with the brackets if you want to use them. I just use the little stick-on rubber feet for it, it raises the strip about 1/4 inch off the glass. You can find replacement CF
bulbs on big al's. The number of led
moonlights depends on how long the strip is I think- since I got the 24" one it only has one led
(that's enough for a 20 gallon), but my LFS
showed me a larger one on their display tank and it had 3 leds. I don't have a pic on the bottom, but I can tell you that the strip has a plastic cover over the bulb that you slide out when you want to replace the bulb. HTH
and if you have any other questions PM me and I'll answer when I get back in town on Monday.