convert lumens to candlepower formula
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Formula to convert Lumens to Candle Power? http://www.theledlight.com/lumens.html. Candlepower is a rating of light output at the source, using English measurements. Foot-candles are a measurement of light at an illuminated object. Lumens are a metric equivalent to foot-candles in that they are measured at an object you want to illuminate. Divide the number of lumens you have produced, or are capable of producing, by 12.57 and you get the candlepower equivalent of that light source. 1  Share. 2  Share this post on.
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- under (2) calculate street light luminaire watt it is mentioned as lux per squire meter it should be lumens per squire meter. Lux means lumens per squire meter. The distance of 50 meter with 7 meter high pole seems more .
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- Lux to footcandles calculator ►. The illuminance Ev in lux (lx) is equal to the illuminance Ev in footcandles (fc) divided by 0.09290304: Ev(lx) = Ev(fc) / 0.09290304 = Ev(fc) × 10.76391. 1  Lux to footcandles calculator.  Lumens to lux calculator.
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Lumens vs. Watts for LED Bulbs A lightbulb that is rated at, say, 200 watts uses more electricity to produce light than a bulb rated for 100 watts. The benefit, however, is that the 200-watt bulb produces significantly more light than the lower-rated bulb.EDs that are bright enough to replace incandescents for household use---that is, producing the same number of lumens as standard 40- or 60-watt bulbs---typically only use 9 to 12 watts.
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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.But you don’t need to understand yet another conversion. It’s simple. The more lumens, the brighter the bulb.lthough “watts” refers to how much energy a bulb will use when lit, we understood the relative brightness levels between 60-watt, 100-watt or 150-watt light bulbs.
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Flashlight The light output of an incandescent lamp in a flashlight varies widely depending on the type of lamp. A miniature keychain lamp produces one or two lumens. A two D-cell flashlight using a common prefocus-style miniature lamp will produce on the order of 15 to 20 lumens of light and a beam of about 200 candlepower.
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Watt's Going On: Choosing the Correct Bulb by Converting Watts to Lumens Here's a handy guide to shine some light on how to choose the correct light bulb in this new age. Traditionally household incandescent light bulbs were rated between 40 to 100 watts. In comparison, newer LED or CFL light bulb come equipped for as little as 5 to 15 watts. The reason for this discrepancy is wattage tells you how much energy a bulb uses. And since the new LED and CFL light bulbs use much less energy, their wattage is much lower.
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What today's consumers need to know about lumens A LUMEN is a unit of measurement of light. It measures light much the same way. Remember, a foot-candle is how bright the light is one foot away from the source. A lumen is a way of measuring how much light gets to what you want to light! A LUMEN is equal to one foot-candle falling on one square foot of area.
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Thread: Formula for converting HP to AMPs or Visa Versa Volts x amps = watts and 746 watts = 1 horse power. Working backwords however from horsepower to watts you need to take into account motor efficiency. HP*746/efficiency = electrical power input. Most home use motors are in the upper 80 or low 90% range. High efficiency industrial motors are more like 97 or 98% efficient. P.S. this is all for single phase power.
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- For a directional light source like a spotlight, the lumen measurement makes more sense. 3 Million Candela vs. 600 Lumens. So how is 600 lumens different from 3 million candelas? One lumen is one candela times one steradian, so the amount of candela divided by the number of steradians gives the directional light intensity. Since there are 12.56637 steradians in a sphere, 6 million candelas equal 238,732.42 lumens per steradian. This means a light source which emits 6 million candelas is much stronger than one which emits 600 lumens. Lightbulbs and LEDs for illumination carry ratings in lumens, according to a recent rule in the European Union.
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How to convert lumens to watts How to convert luminous flux in lumens (lm) to electric power in watts (W) .
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- Lumens to watts calculation formula. The power P in watts (W) is equal to the luminous flux φ V in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W): P (W) = φ V(lm) / η (lm/W). So.
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Frequently Asked Questions - FAQs New Light Bulb Standards for a More Efficient California 23 watts. Typically, the output of a 100-watt incandescent bulb is about 1,600 - 1,700 lumens, a measurement of lighting power. Beginning in mid-2011 new labels will be required on light bulbs. When these labels become available, simply look for a lumens rating to choose a replacement bulb.eginning January 1, 2011 light bulb manufacturers will be required to meet new efficiency standards in California to save consumers money and energy. The standard, passed by Congress and signed by President George W. Bush, becomes effective nationwide January 1, 2012.
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- Since peak beam candlepower is a measure of the reflected light, there is no way to convert peak beam candlepower into lumens. The BrightGuy website shows light output in peak beam candlepower (referred to as candlepower or CP) and/or lumens. This information comes directly from the manufacturers.
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Convert mAh to Watt hours Convert mAh to Watt hours. Insert milliamp hour (mAh) and voltage (V) and click on Calculate to obtain Watt hours (Wh). Formula is (mAh)*(V)/1000 = (Wh). For example, if you have a 300mAh battery rated at 5V, the power is 300mAh * 5V / 1000 = 1.5Wh. Convert Watt hours to mAh. Insert Watts-hour (Wh) and voltage (V) and click on Calculate to obtain milliamp-hours (mAh). Formula is (Wh)*1000/(V) =(mAh). For example, if you have a 1.5Wh battery rated at 5V, the power is 1.5Wh * 1000 / 5V = 300mAh.
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All You Need To Understand About Energy-Efficient Home Lighting: Watts vs. Lumens But with the new lumen measurement, you can know exactly, without guessing, the brightness of light a certain number of lumens will produce. Let's consider some examples that compare and convert watts to lumens: • 1  A 40-watt incandescent bulb equals around 450 lumens. •  A 60-watt incandescent bulb equals 800 lumens.
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Simplifying Lighting: What Are Footcandles and How Many Do You Need? So how do you determine which light fixture is going to be the best replacement if you can’t just swap them out, watt for watt, like the old days? The actual measurement of how much light a lamp emits is referred to as “lumens.” However, the total lumens produced by a fixture, or “light source lumens,” is not always equivalent to the number of lumens that are actually delivered. One way to measure the amount of light thrown from a fixture is by “footcandles” (fc). When choosing an LED light, two of the most important data points to consider are lumens and footcandles. You can see a guide of recommended footcandles here.
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Light Bulb Buying Guide Standard 100-watt bulbs produce about 1600 lumens. Watts - the amount of energy a light bulb uses. The lower the watts, the lower the electric bill. CFLs and LEDs have a lower wattage than incandescent bulbs, but emit the same light output.
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How Much Light Do LED Bulbs Produce? An LED light would need to be about 6 watt in power to produce the equivalent 600 lumens produced by a 50 watt halogen. We can now see clearly that a 3 watt LED spotlight would produce 300 lumens, not 600 lumens, so definitely not equivalent to a 50 watt halogen bulb. When choosing an LED bulb compare how many lumens the new LED bulb produces with how many lumens your old bulb produces.
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Thread: Candlepower/Lumens Re: Candlepower/Lumens. Originally Posted by mtbkndad HDSGT, For practical purposes the measurement I got from my lux meter at 37.5 feet and then using the proper formula to convert that reading to cp and the resulting 376,388 cp is an easier way to get a real world rather then theoretical approximation of the cp.
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HID vs. LED Lighting A common measurement of source efficacy is lumens per watt , which reflects the amount of light produced by the source divided by the power required to operate it. Some LEDs and HID sources, such as high pressure sodium (HPS) and metal halide (MH) , appear very efficient (e.g., 100 lumens/watt or higher) when one focuses solely on source efficiency. However, source efficiency does not accurately reflect how much light is actually delivered from the light source to the target area, such as a street or a parking lot.
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- The unit of measuring the brightness-or to use the precise scientific terminology, illuminance-in SI system of measurement is lux or lumen per square meter.Illuminance is measured in foot candles. One foot-candle is equal to 10.76 lux. Please note that lumen is the measure of total light emitted by a source of light.he total amount of visible light is measured in units of lumens. How bright it appears when it falls on a surface area is illuminance. When the same luminous flux falls over a larger area it will appear to be less bright. 1 lx = 1 lm/m^2 which in terms of the basic SI units is 1 cd*sr*m^-2.
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Candlepower Compared to Lumens It is almost solely a function of the lamp, and for practical purposes is equal to the lamp output which lamp manufacturers rate in Mean Spherical Candela (Sometimes called Mean Spherical Candlepower which is not the same as peak beam intensity), or in lumens. Multiply candela by 12.57 to convert to lumens.
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- Current labeling already helps make the switch from thinking in watts to thinking in lumens. The next three slides show three packages for three different types of A19-shaped light bulbs — incandescent, LED and CFL — that all produce approximately the same lumens. This 40-watt incandescent bulb equals 500 lumens. Photo: Inset from Philips light bulb package.
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Answers about CFL, HPS, How Much Light... 400w HPS = 50000 lumens = 125 lumens/watt. 600w HPS = 90000 lumens = 150 lumens/watt. So you can see that HPS is more efficient than CFL...and as you get into bigger HPS bulbs, it becomes a lot more efficient. There's also fewer hassles with multiple cords and saved money on your energy bill. PAR watt directly indicates how much light energy is available for plants to use in photosynthesis. The output of a 400 watt incandescent bulb is about 25 watts of light, a 400 watt metal halide bulb emits about 140 watts of light.
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Decibel-Watt (dBW) How to convert power in watts (W) to dBW. The power in dBW is equal to the base 10 logarithm of the power in watts (W): P (dBW) = 10 log 10 (P (W) / 1W).