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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]
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When a building is renovated, vault lights may be removed or concreted over. For instance, the floor of New York's mostly-demolished old Pennsylvania Station was made of vault lights, to let light through the concourse floor onto the platforms. [8] The undersides of the lights can still be seen, but the tops have been concreted over (see images ...
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Daylighting can cut lighting energy use in some buildings by up to 80%. [7] Toplighting (skylights) works well with sidelighting (windows) to maximize daylighting: toplighting is able to bring light into centralized areas of a building; daylight is available throughout the day from both ambient lighting from the sky and direct exposure to the sun.
Photos and videos captured the "biblical devastation" in Asheville, North Carolina as residents scramble to find resources after flooding and power outages caused gas and water shortages.. Roads ...
Southeast Texas has been hit with heavy rains and rising rivers, leading to school closings, high-water rescues and mandatory evacuation orders in some areas. Here's a look at the situation ...