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If incandescent bulbs are effectively banned a lot of light fixtures will be obsolete unless you get the new bulbs filled with poisonous mercury vapor.
I saw a report of a Home Depot store that was shut down because someone called 911 when a mercury vapor bulb was dropped in one aisle of the store. It was still in the original box, lying on the floor, and a HAZMAT team showed up with space suits and plastic tunnels from the parking lot, all to go in and clean up one broken bulb on the floor of the store. Amazing.
A lot of automobile bulbs are incandescent, like turn signals and license plate lamps, without which you can get a citation for equipment violation. So you ought to stock up on those bulbs, too, before they're no longer available. They're not very expensive, but if they're suddenly gone, not having one can cost like crazy with the vehicle laws going on. One ticket is enough to pay for 50 bulbs, or more.
They're also used for instrument panels, dome lights, and accessories. A lot of headlights are still incandescent in new cars. Some have changed over to the LED and such, but most are still tungsten filament or halogen, which is incandescent.
I have some desk lamps that only use halogen bulbs, and they last for several years, costing around $3 - $5 each. But replacing the lamps can be $hundreds.
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