[orbital-decay]

> the failed promises of LED longevity

LEDs last remarkably long if used correctly. You can make a light that will easily last thousands/dozens of thousands of hours. What doesn't last is a typical LED lightbulb for legacy sockets, because of the planned obsolescence/race to the bottom, and because it's a complete device (power supply, heatsink etc) which is far too powerful for its form-factor. Not sure what of that you expect to change.

[Maursault]

LED phosphors begin to fade immediately. Within dozens of hours of use it will produce noticeably different light, getting bluer and bluer over time.