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light bulb a glass object that fits into a lamp or similar device and produces light.
light pen an electronic device that can detect light and dark areas on a computer screen. It is used to select objects on the screen.
light switch a device, especially one that is attached to a wall or a lamp, used to turn a light on or off.
light-year a unit of distance equal to the distance light can travel in one year, about six trillion miles.
make light of to treat as or consider silly or not important.
traffic light a street or road signal used to tell drivers when to stop or go. The signal changes colors from red to green to yellow.