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The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. [4]
In 1999, Lumileds Corporation of San Jose, California, introduced the Luxeon LED, a high-power white-light emitter. This made possible LED flashlights with lower power consumption and running time better than incandescent flashlights with similar light output. The first Luxeon LED flashlight was the Arc LS, designed in 2001.
Solar traffic lights are signalling devices powered by solar panels positioned at road intersections, pedestrian crossings and other locations to control the flows of traffic. They assign the right of way to road users by the use of lights in standard colors (red - amber/yellow - green), using a universal color code .
One of the first applications of concentrated solar was the 6 horsepower (4.5 kW) solar powered motor made by H.E. Willsie and John Boyle in 1904. [ 113 ] An early solar pioneer of the 19th and 20th century, Frank Shuman , built a demonstration plant that used solar power to pump water using an array of mirrors in a trough to generate steam.
Streamlight is a company located in Eagleville, Pennsylvania, United States, that manufactures flashlights powered by various rechargeable and disposable batteries. [2]Their product line features hand-held and weapon-mountable lights [3] as well as a right angle light used by firefighters on their turnout gear. [4]
The introduction of LED lighting has greatly improved this by approx. 90% when compared to a halogen downlight or spotlight. LED lamps or bulbs are now available to retro fit in place of high energy consumption lamps. Uplighting is less common, often used to bounce indirect light off the ceiling and back down. It is commonly used in lighting ...
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