You got my curiosity up so I got one of these marineland LED lights. In my opinion they are not as bright as a 20 watt CFL daylight bulb, but they are not very far off. Petsmart is selling it right now for about $32 + tax. Bit overpriced but I'm very impressed with the lack of heat from the lights. The one major downside is that there is no protection of the LEDs themselves - you could splash water on them because there's no cover.