no they aren't t5's. they are t10's i think. and they have internal drivers that allow them to be placed in regular fixtures.

oh and did i mention that the inexpensive fixture you can get allows the bulbs to be individually controllable!!!

i really don't know how these bulbs aren't all over rc yet...

here's a link:

http://www.reefbuilders.com/2009/04/...aquarium-leds/

~alex