Silver Surfer wrote:

Does anyone recall those power saving "discs" for light bulbs they were
selling back during the oil embargo days of the 70's. The disc was placed
in a standard light bulb fixture and the light bulb was screwed in next.
The disc was nothing more than a diode that "saved energy" by blocking power
to the bulb for half of each cycle.

A complete waste of time for all the reasons given by other posters.

Use CFLs or a lower wattage incandescent bulb.

Graham