Most toaster ovens use a specific type of light bulb called an "incandescent lamp" or "incandescent light bulb." These bulbs are typically small and can withstand the high temperatures inside a toaster oven.
The incandescent light bulb works by passing an electric current through a filament, which then heats up and produces light. While these bulbs are not as energy-efficient as newer technologies like LED bulbs, they are commonly used in toaster ovens because they can handle the heat and provide sufficient illumination for the oven's interior.
However, it's worth noting that some modern toaster ovens might use alternative lighting sources, such as halogen bulbs or LEDs, which are more energy-efficient and can also withstand the heat of the oven. If you're uncertain about the type of light bulb your toaster oven uses, it's best to refer to the user manual or contact the manufacturer for specific information.