how many lumens do you 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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Most heated tile floors and 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 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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Solar LED path lighting has come a long way. Bollard lights are a popular choice for effective path lighting. 100 lumens is considered bright enough for most walkways — including commercial properties. 100 lumens is equivalent to about 20 watts.
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For example, if you are using a traditional (incandescent) bulb in the range of 40-60W you need a LED bulb in the range of a 5W-8W as it is equally bright (450 lumens) & hence will give you same amount of brightness with less power consumption. This in turn saves your money as it reduces your electricity bill.
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Just aim for about 150W of CFLs in Total Per Plant to Start, and stick to relatively smaller size bulbs if you can! If you want them to screw into regular light bulb sockets, use ones with a “medium base”.
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For the average space of 250 square feet, you'll need roughly 5,000 lumens as your primary light source (20 lumens x 250 square feet).
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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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A general rule of thumb is to use 130 to 150 lumens per square foot of work space.
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A typical 60W incandescent light bulb produces between 650-850 lumens. If you average that out to 750 lumens, you could surmise that 1 Watt = 12.5 lumens (750 lumens divided by 60W).
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40-watt bulb produces 450 lumens of light. 60-watt bulb produces 800 lumens of light (most widely used in households) 75-watt bulb produces 1,100 lumens of light. 100-watt bulb produces 1,600 lumens of light.
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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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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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That means that you should go for a projector with thousands of lumens, not hundreds. For dark rooms, 1,000 lumens usually works fine. ... For daylight viewing outdoors, go for the highest possible lumens. If the screen is quite large, say 40 feet, you'll want to consider a 5,500-lumen projector.
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40 Watt Equivalent , G9 LED, Dimmable Light Bulb, (3000K) G9/Bi-Pin Base are dimmable and efficient. Consuming just 4 Watts, they have an output of 400 lumens.
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ABSOLUTELY! 2 minutes is more than enough time to damage your eyes for life. 300 lumens can cause a hotspot and can burn holes even if you don't notice.
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One lux is equal to one lumen per square metre: 1 lx = 1 lm/m2 = 1 cd·sr/m2. A flux of 1000 lumens, spread uniformly over an area of 1 square metre, lights up that square metre with an illuminance of 1000 lux.