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#Candela lumen movie

To calculate Watts from foot-candles: Watts = Lumens x 0.001496.

To calculate Lumens (Lux) from foot-candles: Lumens = Foot Candles x 10.76.

This means that your 50 foot-candles would equal 0.805 watts per square meter. After you have your total number of lumens calculated, you take the total number of lumens and multiply that by 0.001496.įor example, 538 lumens x 0.001496 watts = 0.805 watts per square meter. In order to calculate your number of watts, you must know that one lumen equals 0.001496 watts. One foot-candle equals 10.76 lumens (a lumen is considered the same as lux, which is what most modern light meters calculate their measurements in), so in order to convert your foot-candles to lumens, you will need to take the amount of foot-candles measured and multiply by 10.76 to get the number of lumens.įor example, 50 foot-candles would be 50 x 10.76 = 538 lumens. So, quick math will show us that 1 lux is equal to 0.092903 foot-candles. That’s the number to divide your lux by in order to get foot-candles. If you do get a light meter that renders its measurements in lux, and you really need them in foot-candles, just remember this number: 10.764. Most light meters will output their readings in foot-candles or “lux”(the SI-derived unit which is similar to foot-candles but measures a one-meter square rather than a one-foot square). The right meter for you is one that is accurate and fast. Some are as affordable as $20, some are pricier at $200 (or more). Light meters are available from many manufacturers at many different price points. The best tool for your photometric (and thus your foot-candle readings) is a sensitive light meter. Foot-candle measurements are the thing you need to make sure your tool–light–is working properly.

As mentioned earlier, light in public areas should typically be lower and warmer, while work areas should receive lots of bright light. Like many tools, it can be used in different settings for different effects. Really, that’s what light is for your business: another tool. Photometry, the measurement of light as our eyes interpret it, is important for businesses and organizations of all kinds because you need to know what customers and staff are experiencing every time they work or shop in one of your buildings. This is different from “ radiometry,” which is the measurement of all forms of radiant energy (including light) in absolute terms. Measuring foot-candles falls under a broad branch of scientific inquiry called “ photometry.” Photometry is the measurement of light as our eyes perceive it. If you have special requirements for how much light needs to be hitting a given space, you’ll want to know how many foot-candles are shining on that space. Without light, we simply can’t live and work the way we need to.

#Candela lumen movie

Movie and video producers carry little meters with them to check foot-candles on subjects they’re going to shoot.Īny business or organization that has physical security requirements also need to be aware of the foot-candle readings in sensitive areas, and around cameras and doors. Horticulture requires very accurate foot-candle readings in order to make sure all plants are bathed in the appropriate amount (and type) of light.

Museums need specific light levels to create the right ambiance and avoid damaging sensitive artifacts. There are lots of organizations that have special lighting requirements, and foot-candles are the go-to measurement to make sure the right amount of light is actually touching the objects it needs to illuminate. Offices, manufacturing facilities, and workrooms need significantly higher foot-candle measurements in order to make work easier and less stressful on your eyes. This can be very important fo r electrical construction as well. So, what is the use of a measurement like foot-candles? Basically, the idea of using foot-candles is to ensure that areas that require certain light levels are actually receiving those light levels. Lux is essentially the same as foot-candles, but it defines the area being lit as a one-meter square, rather than a one-foot square. In other parts of the world, such as Europe, the SI-derived measurement called “lux” is used. Here are some typical foot-candle measurements for given light conditions:Īt this point, it should be noted that “foot-candles” as a unit of measurement are used most commonly in places that follow the United States customary units of measurement.

But what does that mean, exactly? Well rather than measuring the amount of light that leaves a light source (lumen output), foot-candle measurements focus on the amount of light that reaches a surface area.įor example, a foot-candle relates to the amount of light that is on the ground surface beneath a parking lot light as opposed to the output of the parking lot light.