I use full spectrum lights for reef (sal****er) lighting in my 55g tank.
I also keep low light plants in there and the reef lighting is the best
thing I have ever used. the watts are still 15 but the K is over 7,000.
Fish really seem to stand out too. You should not have any problem
finding them at your LFS as long as they stock supplies for salt water
tanks. If they don't a regular full spectrum light will be just fine
for your sized tank.

Vicki