Why is it called foot-candle?

Why is it called foot-candle?

General Electric Light Meter used in photography to measure light values in foot-candles. The unit foot-candle is defined as the amount of illumination the inside surface of a one-foot-radius sphere would be receiving if there were a uniform point source of one candela in the center of the sphere.

What does 10 foot candles mean?

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. A higher number of lumens are indicative of a brighter, more intense light, whereas a lower number of lumens represent dimmer, more subdued lighting.

How many foot candles is a full moon?

0.01 foot-candle
Full daylight typically equals about 1,000 foot-candles, while an overcast day would have only 100 foot-candles of light. Twilight produces just 1 foot-candle, while a night with a full moon has 0.01 foot-candle and an overcast night has only 0.00001 foot-candle.

What is 50ft candle?

For example, 50 foot-candles would be 50 x 10.76 = 538 lumens.

What is meter candle?

meter-candle in American English (ˈmitərˌkændl) a unit of illumination, equivalent to 0.0929 foot-candle and equal to the illumination produced by luminous flux of one lumen falling perpendicularly on a surface one meter square; lux.

Is lux an Indian brand?

Lux industries, previously known as Biswanath Hosiery Mills, is an Indian underwear company headquartered in Kolkata, West Bengal, India. Its offerings include various kinds of hosiery products for men, women and children. It is one of the oldest underwear companies in India.

What does lux mean in Latin?

light
Latin, light — more at light.

Which curve represents the life of the lamp?

Curve B curves
Curve B curves represent the life of a lamp (Life of the lamp ∝ 1/V13).

What is the definition of a foot candle?

A foot-candle (or foot-candle, fc, lm/ft2, or ft-c) is a measurement of light intensity. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light.

How big is a foot candle on a light meter?

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). 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.

How are foot candles related to lumen output?

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. For 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.

What’s the best way to read a foot candle?

The best tool for your photometric (and thus your foot-candle readings) is a sensitive light meter. Light meters are available from many manufacturers at many different price points. Some are as affordable as $20, some are pricier at $200 (or more). The right meter for you is one that is accurate and fast.