If you are good with electronics go for power LEDs but cooling them is VERY important.
If you are not so good with electronics, make 2 per sqaure feet from my dumpy proof simple version(of course, I can build an optimized one too-you will have to wait til I have time to write it up in that thread.) Each one from mine uses about 1W, get a transformer accordingly. Note the discussion about improving the design-adding a small resistor(~5ohms) will help a lot in case there is surge when you flip the switch very frequently.
If you are completely not good at electronics, then hire someone to build an optimized version for you. HAAAHHA
