Non-Dimmable Retrofit LED Lamps come in 277 V versions.

Leveraging chip on board LED package to optimizes lumen output, LED PAR30 and PAR38 lamps are offered in 3000K and 4000K color temperatures and rated for

[source: http://news.thomasnet.com/fullstory/Non-Dimmable-Retrofit-LED-Lamps-come-in-277-V-versions-20041655]