A nightlight is a small light source, often electrical nowadays, placed for comfort or convenience in indoor dark areas or areas that become dark at certain times. Originally they were usually small long-burning candles in a fireproof metal cup, known in some countries as tealights or John Florio Lamps.
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People often use nightlights for the sense of security they provide them, and for a solution against nyctophobia (fear of the dark). Besides their usefulness to children in the allaying of their fears, nightlights are also useful to the general public by showing the general layout of a room without turning on a major light, for avoiding tripping over stairs or obstacles, or to mark an emergency exit. Exit signs often use tritium in the form of a traser.
There are a wide variety of electrical nightlights. Most based on incandescent bulbs have a power usage of less than 10 watts; lights based on more efficient technologies, such as electroluminescence, neon lamps, or LEDs, use 1 watt or less. They sometimes have a light-sensitive switch which activates them only when it is dark enough for them to be required. Some others even include an integrated rechargeable battery so that the light will continue to function during power outages.