In the case of incandescent bulbs there seem to be few projects using them, instead most mentions of them come from replacing them with LEDs in old projectors or other devices.

A newly developed white organic light-emitting diode operates at under 1.5 volts, report researchers from the Institute of Science Tokyo. By using triplet–triplet annihilation to generate blue ...

With the maximum permissible contact voltage being set at 120 volts, that limits the number of connected LEDs to 40.

WEST LAFAYETTE, Ind. — Purdue University researchers have designed two simple LED lighting strategies to increase yield and reduce energy costs for the vertical farming sector of indoor agriculture.