Under a little-known requirement that went into effect this week, the last of the “general service” incandescent bulbs—descendants of the original light bulb invented by Thomas Alva Edison in 1879— can no longer be manufactured or imported into the U.S.

DOE has published a new report, Dimming LEDs with Phase-Cut Dimmers: The Specifier's Process for Maximizing Success. The report was created in response to issues raised about dimming by energy efficiency organizations and specifiers, and is based on experience from CALiPER testing and GATEWAY demonstrations.