how many lumens do i need per square foot?
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To determine the needed lumens, you will need to multiply your room square footage by your room foot-candle requirement. For example, a 100 square foot living room, which needs 10-20 foot-candles, will need 1,000-2,000 lumens. A 100 square foot dining room, which needs 30-40 foot-candles, will need 3,000-4,000 lumens.
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5 Watt Bulb: The early generation 5 Watt LED bulbs had LEDs with 100 LPW ( Lumens Per Watt). ... However the 10% loss in the diffuser dome etc, would only deliver just 360 Lumens net. That means, to match 720 lumens of a traditional 60W incandescent, we would have needed two 5 Watt LED bulbs.
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Power consumption and performance: LED rope lights require far less energy than incandescent rope lights and generate comparatively less heat. LED bulbs use about 1 watt per foot in power while a traditional rope light uses close to 3 watts of light per foot.
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Motion Activated Plug-in Night Lights And it's brighter with around 40 lumens (others normal type just 15-20 lumens). The motion-activated night light is ideal for hallway, entry, stairs, bathroom, garage, basement, etc where you didn't have to turn on a lot of lights just to get to another room.
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Grow Lights, Reflectors, Holders & Straps They're one of the most important pieces of equipment you'll buy, so you have to make sure you choose a grow light that is suitable to your grow tent. ... If you're using an HID grow light a good rule of thumb is that you'll need roughly 45-70 watts per square feet of tent space.
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Understand Efficacy (Lumens/Watt) The old technology of tungsten incandescent bulbs only had an efficacy of about 15 lumens/watt; LED technology can produce about 60 lumens per watt. In other words, LEDs are about 4 times more efficient at producing light than incandescent bulbs.
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For the average living room of 250 square feet, you'll need 5,000 lumens as your primary light source (20 lumens x 250 square feet), equivalent to about five 100 watt incandescent light bulbs, five 23 watt CFLs, or eight 10 watt LED light bulbs.
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Lumens measure brightness. A standard 60-watt incandescent bulb, for example, produces about 800 lumens of light. By comparison, a CFL bulb produces that same 800 lumens using less than 15 watts.
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Most electric floor heating systems use 12 watts per hour per square foot, meaning a 100-square-foot room would use 1200 watts in total every hour, or 300 watts LESS than the average space heater.
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A lumen is a measure of lighting brightness, and is a handy way to compare today's new energy-efficient light bulbs. Lighting fixtures and bulbs have labels that indicate lumens per device. A general rule of thumb is to use 130 to 150 lumens per square foot of work space.
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Sometimes the term "luminous efficacy" is used. This is a measure of how well a light source converts energy (watts) into light (lumens). The old technology of tungsten incandescent bulbs only had an efficacy of about 15 lumens/watt; LED technology can produce about 60 lumens per watt.
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LED bulbs that have the same wattages might not necessarily have the same lumens ratings. For example, a particular 5W GLS might emit 400 lumens, while another one might emit 470 lumens.
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A foot-candle equals one lumen per square foot. This is a British measurement. Using the metric system, a lumen is measured by a square meter or a lux. Thus a foot-candle is equivalent to approximately 10 lux or 10.57 lux.
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Make a Plan Whatever new recessed lighting you add should work with your existing fixtures. Measure your room to see how many fixtures you will need. A common rule of thumb is that you use one recessed light for every 4 to 6 square feet of ceiling space.
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Convert Area to Number of Tiles If the tiles are 12-inch squares, one tile will cover one square foot. If the tiles are 4-inch squares, you'll need nine tiles to cover one square foot. Perform this calculation by multiplying 12 by 12 to equal 144 square inches (the surface area to cover).
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A lumen is simply a measurement that describes the amount of light produced by a bulb or fixture. Using the list, you'll see that an office would need an average of 40 foot-candles or 40 lumens per square foot.
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Measure your garage to determine your true light output needs. The Illuminating Engineering Society (IES) Lighting Handbook recommends 50 lumens (a measure of light output) per square foot in residential garages and 300 lumens per square foot in workshop areas.