[Yo-Yo]

I’ve [not] read a good description of how it works - the conventional approach to making enough of an electron beam to excite phosphors is with several KV of high voltage, and that would seem to imply a potentially noisy (EMI-noisy) switching power supply. Anyone know?

5K volts are generated. The claims are that there are no X-Rays or EM interference generated.

Electron Stimulated Luminescence

I don't see how the light quality could be 'better' than CFLs, since both use phosphor stimulation to generate visible light. It all depends on the phosphor mix used.

Watching the lumen output of LED flashlights grow and grow over the last few years, my money is still on an affordable LED bulb coming out one day.

[bigbob]

Thanks, that’s what I figured. Will be interested to see how much EMI they emit. For all their other sins, the CFLs are reasonably clean.

[Wonder Warthog]

"I don't see how the light quality could be 'better' than CFLs, since both use phosphor stimulation to generate visible light. It all depends on the phosphor mix used."

Phosphor spread out over a larger area yields a more "diffuse" multipoint source, thus less "glare". VERY high output LED's are worse than CFL's about "glare". The more closely the source approximates a "single point source" the worse the glare.

But you're right that the overall spectral output should be the same.

[loungitude]

The claims are that there are no X-Rays or EM interference generated.

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It’s a safe bet that “no x-rays or EM interference” really means “it passed the regulatory test for radiated emissions” NOT “there are no EM emissions”.