What does a foot-candle meter measure?
It’s used to describe how bright a light is in an area, with the standard measurement of the one-foot candle being the equivalent of one lumen of brightness, covering one square foot, from a distance of one foot from the light.
What is the equivalent unit to a foot-candle?
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.
How many lumens is 50 foot candles?
538 lumens
For example, 50 foot-candles would be 50 x 10.76 = 538 lumens.
What is light intensity?
Light intensity refers to the strength or amount of light produced by a specific lamp source. It is the measure of the wavelength-weighted power emitted by a light source.
Are lumens and footcandles the same?
One lumen per square foot equals one footcandle, while one lumen per square meter equals one lux. Both of these units measure an area’s illuminance, just as both miles and kilometers measure distance.
What is meant by foot-candle?
Definition of foot-candle : a unit of illuminance on a surface that is everywhere one foot from a uniform point source of light of one candle and equal to one lumen per square foot.
How many foot candles are in a watt?
Foot-candle to Watt/sq. Cm (at 555 Nm) Conversion Table
| Foot-candle [ft*c, Fc] | Watt/sq. Cm (at 555 Nm) |
|---|---|
| 1 ft*c, fc | 1.5759751708199E-6 watt/sq. cm (at 555 nm) |
| 2 ft*c, fc | 3.1519503416398E-6 watt/sq. cm (at 555 nm) |
| 3 ft*c, fc | 4.7279255124597E-6 watt/sq. cm (at 555 nm) |
| 5 ft*c, fc | 7.8798758540995E-6 watt/sq. cm (at 555 nm) |
How many foot-candles is low light?
Plants referred to as low light intensity plants generally should receive between 50 and 250 foot-candles. Under artificial light, a few plants in this group can be maintained at as little as 10 foot-candles. Low-light plants should receive between 10 and 15 watts of fluorescent light per square foot of growing space.
What is unit of light intensity?
The candela (symbol: cd) is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function.
How do you use a lux meter to measure light intensity?
One lux is one lumen per square meter. A working example, We have a light source whose total light produced (luminous flux) is 1000 lumens. If we could focus this onto the surface of 1 square metre we would have an illuminance of 1000 lux….How to Measure Light.
| Examples of light levels | |
|---|---|
| Twilight | 10 Lux |
| Full Moon | < 1 Lux |
How do you calculate light intensity?
Using L for luminosity, the intensity of light formula becomes I=LA I = L A . Because light waves spread in all directions, to accurately calculate light intensity, the denominator in the formula must be the surface area of a sphere. In fact, most electromagnetic calculations are done over a sphere.
How many lumens equal a foot-candle?
10.76 lumens
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.
What is a foot candle used to measure?
Believe it or not, foot candles are the most common unit of measure used by lighting professionals to calculate light levels in businesses and outdoor spaces. In a nutshell, a foot candle is a measurement of light intensity and is defined as the illuminance on a one-square foot surface from a uniform source of light.
How many lumens are in a foot candle?
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. A higher number of lumens are indicative of a brighter, more intense light, whereas a lower number of lumens represent dimmer, more subdued lighting.
What does the 401025 light intensity meter measure?
The 401025 light intensity meter is able to measure a wide range of light sources up to 50,000LUX or 5,000Fc. The included light sensor is attached to a 45” (1.1m) cable, allowing you to get closer to the light source and take more accurate measurements.
How does the Extech 401025 foot-candle/lux light meter work?
The Extech 401025 Foot-Candle/Lux Light Meter measures light levels in three ranges: 0-200, 0-2,000, and 0-5,000Fc (foot-candles) and 0-2,000, 0-20,000, and 0-50,000Lux with a 5% accuracy using a precision photo diode and color correction filter. The device’s large LCD display allows the user to quickly read and interpret data right on the meter.