I like the fact that you can find 420, 410, and 450 nm, and pure white LEDs, and lace them together to get one larger light source.
Over at nano-reef.com, many people have been swapping around, toying with, and building entire light canopies out of LEDs (superbrights and regular). All seem to have great results.
The best example is a 2.5g that runs entirely on LEDs to grow not only softies, but SPS and LPS as well.
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