An article that resembles such a bulb and converts electricity to light by any process.
An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
Used in reference to the sudden arrival of a realization, an inspiration, an idea, or the like.
Light from above; toplighting.
Any glazing above a main window, partition or door
A skylight.
The upper (and usually smaller) part (casement) of a window, often hinged a the top