bulb (n)

I had to change the light bulb in my bedroom.
He carefully unscrewed the old, burnt-out bulb from the ceiling fixture and replaced it with a new, energy-efficient LED bulb.
The room was illuminated by a pendant light with a decorative, frosted glass bulb that diffused the light beautifully.
When the lamp's bulb suddenly flickered and went out, she realized it was time to purchase a replacement to restore proper lighting to the room.