LED is the way to go
LEDs are nice but they do have limitations, Id imagine there must be possibilities with miniature HID bulbs of various type gasses also
LED’s do not have the fragility or disposal problems of CFL’s. The new high output LED’s are in fact more efficient than the CFL’s. The only drawback with the “white” LED’s is that their spectrum is a bit too much to the blue end. In time, that will be solved.