There is already a crude replication on Hartmann's site. Details sparce, but the core is not radioactive, at least.

I had hoped by now that there would have been some published replications. Maybe this weekend. If and when, or should I say 'as soon as' this happens, then people will be thinking about "how" it might be possible to take the concept to the next level.

One strategy of interest would be an Edisonian approach to the finding the best possible core, the best possible LEDs and then the best possible combination of the two.

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