The correct spelling is LED bulb.
LED stands for Light Emitting Diode. It's an abbreviation, so it's typically written in all capital letters. "Bulb" is a common word referring to the glass housing that contains the light source. Therefore, "LED bulb" is the correct way to spell it.
Here's a breakdown:
- LED: Acronym for Light Emitting Diode.
- Bulb: The glass or plastic enclosure containing the light source.
Therefore, when referring to a Light Emitting Diode bulb, the correct spelling is simply LED bulb.
