The phrase "incandescent bulbs" refers to the traditional, old-fashioned light bulbs that produce light by heating a filament until it glows. Full definition
Let's suppose the room in question is lit by a 100 watt incandescent bulb with an efficiency of about 2.2 per cent, generating about 2.2 watts in the form of light. (newscientist.com)
Replacing traditional incandescent bulbs with CFLs or LEDs is a law that was supposed to go into effect this year but was postponed. (theletteredcottage.net)
We applaud the ban of incandescent bulbs, which has become the target of abuse from the right wing media, (how many times can I cancel my subscription to the National Post?) (treehugger.com)