Plasmick

I haven't made a lighrbulb but I did design one a few years back it consisted of a graphite rod say 5cm long and 6mm wide, which I would have drilled into one end and attached to a support, the other end drilled to 30mm deep, the whole thing fitted inside a pyrex rolling pin with holed rubber bungs partialy coated with foil to reflect heat and light, one to support the graphite rod with a ceramic dowel and the other to evacuate to a high vacuum and alow the beam of a powerful infrared laser to pass through a prizm and heat the graphite internally heat upon heat until light is emitted... Voltage of the laser 3.7v. I wouldn't expect you would need the laser to be permanently on just there to top up heat when it was needed. I also designed a laser amplifyer which I would have also used to assist the formation of heat using a strobe light and a magnetic field to theta pinch the photon rich ion plasma of the xenon gas to the path of a lasers beam .