A nightlight is a small, usually electrical, light source placed for comfort or convenience in indoor dark areas or areas that become dark at certain times. Image File history File links NightLight. ... Image File history File links NightLight. ... Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, electromagnetic radiation of any wavelength. ...
Use and culture
Children often use night lights for the sense of security they provide them. Besides their usefulness to children in the allaying of their fears, night lights are also useful to the general public for allowing sight of the general lay of a room without turning on a major light, for avoiding tripping on a case of stairs, or to mark an emergency exit; the exit signs often use tritium in the form of a traser. A fire escape is a fire exit that is external to a building. ... Tritium (symbol T or 3H) is a radioactive isotope of hydrogen. ... Traser is a registered trademark/name of mb-microtec,a Swiss company engaged in the business of manufacturing GTLS (gaseous tritium light source). ...
There are a wide variety of nightlights. Most based on incandescent bulbs have a power usage of less than 10 watts; lights based on more efficient technologies, e.g. neon lamps and 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. The incandescent light bulb uses a glowing wire filament heated to white-hot by electrical resistance, to generate light (a process known as thermal radiation). ... The watt (symbol: W) is the SI derived unit of power. ... Lighting neon lamp, two 220/230 volt and 110 V neon lamps and a screwdriver with neon lamp inside A neon lamp is a gas discharge lamp containing neon gas (or in types with different colors also other noble gas) at low pressure. ... External links LEd Category: TeX ... A power outage is the loss of the electricity supply to an area. ...
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