I’ve heard it said many times that the use of incandescent bulbs on Shabbat is prohibited from the Torah, because lighting the filament is like building a fire, where as the use of non-incandescent bulbs are prohibited by the Rabbis only because of the prohibition of using electricity on Shabbat. As an electrician, I can tell you that many other types of bulbs also have filaments that heat up. A fluorescent bulb, for instance, has a filament at each end that must heat up to light the gas. How would such a bulb be any different than a regular incandescent? Thank you
You are certainly correct. Lighting Any bulb with a filament that gets red hot is a Torah prohibition.