here is my current progect to light a small 30 gallon tank. i plan to double this setup and use printed circuit boards as the final setup. it should all run of a small computer supply. it's hard to tell how bright the leds are from the picture. leds are all 6000mcd. i'm waiting for another power supply before trying it on a tank. this is the future of tank lighting.
http://www.footprintagency.com/images/reefleds.jpg