Emissive electroluminescence is LED, a 25k-50k hour life. I have a few LEDs in my house that are rated for 50,000 hours(5.7 continuous operating years).
Field-induced polymer electroluminescence is supposed to be a 20,000 hour life source from what I've read. I've tried to find lumen efficacy on these things and the only information I could find that actually compared the two was at 7000k which is very blue, not daylight CFL colored blue but actually visibly blue and the difference was significant in comparison to CFL efficacy but I don't think it would be better than an LED which also has its sweet spot at around 6000k. I'm not sure how much the efficiency changes when bending it back to a common color temperature most people would probably be after such as 3000k.
The only advantage I see if that since it's a field-induced source instead of emissive, it shouldn't be directional specific as LEDs are. We'll see. To me it's a wait and see thing.
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