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I was somewhat surprised by the cost. They mention current LED bulb prices around $100 and are driving it towards $20-$25. Which ones are they talking about? I found some on Amazon for $5-$10.

Maybe it's not the right kind of white light. I know that LEDs have pretty low spread (they only cover 10's of nm in wavelength) and in order to assemble a good white light you have to have the right number and intensity of LEDs to produce the consumer-friendly color.

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I believe the actual problem with LED's is the fact that lowering voltage output to an LED doesn't make the light dim.

I remember reading an article about this somewhere, it was a little over my head but a pretty interesting read if someone has the link available.

The $5-10 bulbs on Amazon are by no means replacements for 60W incandescents - they seem to be 1-3W LEDs, which would only be 10-20W replacements at best.

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