No reports yet of anyone using these:
http://www.creativelightings.com/Red...od-12wc-rd.htm
...which are also sold here:
http://www.amazon.com/Red-Waterproof.../dp/B0039BVS3U

...although this person was going to try them:
http://algaescrubber.net/forums/show...-and-questions

However he did end up using these:
http://www.superbrightleds.com/morei...gn-module/980/

...although it's not clear how much underwater the LEDs are, or what the outcome was:
http://algaescrubber.net/forums/show...-and-questions



This lack of options is why we build our light from scratch with 3 watt leds, although it's customized for our SURF2:
http://www.santa-monica.cc/product.asp?itemid=41



So, here are some other options I googled, but have not tried, and may not even work:

http://www.flexfireleds.com/led-stri...rip-light-reel
(says "3 watts per foot")
http://www.ebay.com/itm/20PCS-Waterp...153#vi-content
(says "0.5 watts per module")
http://www.lux-concept.com/led-modul...oof-p-559.html
(says "0.24 watts per module")
http://www.smart-group.co.uk/red_led_modules.htm
(says "0.48 watts per module", but can't see where to order them)

The trick seems to be search for "channel" lighting for signs.