At <a href="http://www.thinkgeek.com/">Thinkgeek</a> you can get little LED flashlights, one LED burning brightly enough to light up a walkway so you can walk, or a keyhole, etc. It's powered by a button battery so the whole thing is tiny and goes on your keychain. It's really cool, except for hearing everyone around you express how much of a geek you are when you use it. (But I don't care. I AM a geek.)
There's another website that reviews LED flashlights and they are really coming on (sorry for the pun). Unfortunately I don't remember the name of the site. But it also talks about a new light to be used in theatre and displays, that uses an array of different color LEDs to shine ANY color. (It's about $500.)
As far as the high efficiency lamps, a friend of mine uses the high pressure sodium lamps to grow marijuana. I've seen it.. it's a miniature sun.
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