How to Measure Light Intensity
Feb 25, · A lux meter is a device for measuring brightness, specifically, the intensity with which the brightness appears to the human eye. This is different than measurements of the actual light energy produced by or reflected from an object or light source. The lux is a unit of measurement of brightness, or more accurately, illuminance. To perform these measurements, technicians often make use of lux meters which are specialized devices that measure the intensity of light falling on a surface, or “lux.” Examples of practical uses of lux meters include: Checking for lighting system adequacy in office spaces.
We have to measure light in many tasks. For this, the Lux meter should be used. To measure the light accurately, a lux meter is a very suitable device. It is calibrated to read directly in lux. The meters measure illumination in terms of luxes or foot-candles are known as Lux meters or Light meters. A lux is equal to the total intensity of light that falls on a one square meter surface that is one foot away from the point of source of light.
A foot-candle is equal to the total intensity of light that falls on a one square foot surface that is one foot away what is the nfl worth the point source of light. Most of the lux meters consist of a body, photocell or light sensor, and display. The light that falls on to the photocell or sensor contains energy that is converted to electric current. In turn, the amount of current depends on the light that strokes the photocell or light sensor.
Lux meters read the electrical currentcalculate the appropriate value, and shows this value on its display. It is the basic lux meter working principle. Analog luxmeters display values on a dial usually with a needle or pointer whereas digital devices display values as numbers letters.
A Lux meter may be portable or bench type. Since light usually contains different colors different wavelengths, the reading represents the combined effects of all the wavelengths. Typically, standard colors or color temperatures are expressed in degrees Kelvin K. Selecting luxmeters or light meters requires certain performance specifications include photocell, illumination range, Lux resolution, operating temperature and foot candle resolution.
Special features include low battery Indicators, low voltage, alarms, remote light sensors, built-in memory, auto power off, zero function etc. Lux meters are used to measure levels of light in schools, hospitals, production areas, laboratories. They are also used to monitor light-sensitive displays in museums, art galleries etc. The luminous flux falling on a surface per unit area is known as illumination and whats on this bank holiday expressed in lux.
It is also expressed in lumens per square feet. Lux or Metre Candle : It is defined as the illumination produced by a uniform source of 1 C.
Foot : It is defined as the illumination produced by a uniform source of 1 C. An idea of illumination levels can be had from the following data:. No shadows should be allowed to fall on the light sensor during measurements, and the light sensor should be held perfectly horizontally and stationary for accurate results.
Illumination requirement in a room depends upon its type and use. For example, in a bathroom, it is lux whereas in a study room it is lux. Because in a study room we need more illumination to read and write properly. You can measure the illumination level in a room at a particular place with the help of a lux meter and increase or decrease the number of light sources CFL or LED accordingly.
Average illumination over a large area is measured by subdividing the whole area into small zones and measuring the illumination at the center of each zone. Thanks for reading about lux meter what is hand scraped hardwood flooring principle. Your email address will not be published. Skip to content Hi friends, in this article, I am going to discuss about the lux meter woking principle and its application.
What is lux meter? Lux Meter Working Principle Most of the lux meters consist of a body, photocell or light sensor, and display. Leave a Comment Cancel Reply Your email address will not be published.
Illumination (symbol E)
Lux meters are used to measure levels of light in schools, hospitals, production areas, laboratories. They are also used to monitor light-sensitive displays in museums, art galleries etc. Illumination (symbol E) The luminous flux falling on a surface per unit area is known as illumination and is expressed in lux. May 27, · Using a light (lux) meter is the best way to measure light intensity – it gives us the ability to choose the optimal light intensity for an environment. 1. Measure Ambient Light In the Room. To begin, turn off any lighting in the room you’re about to measure. Turn on the light meter to establish what’s known as the baseline measurement – the ambient light. One lux (Latin for “light”) is the amount of illumination provided when one lumen is evenly distributed over an area of one square metre. This is also equivalent to the illumination that would exist on a surface all points of which are one metre from a point source of one international candle. One lux is equal to foot-candle.
This is also equivalent to the illumination that would exist on a surface all points of which are one metre from a point source of one international candle candela.
One lux is equal to 0. Additional Info. Contributors Article History. Print Cite verified Cite. While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions. Facebook Twitter. Give Feedback External Websites. Let us know if you have suggestions to improve this article requires login.
External Websites. Hyperphysics - Lux. The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree See Article History. Learn More in these related Britannica articles: luminous intensity. Luminous intensity , the quantity of visible light that is emitted in unit time per unit solid angle.
The unit for the quantity of light flowing from a source in any one second the luminous power, or luminous flux is called the lumen. The lumen is evaluated with reference to visual…. International System of Units SI , international decimal system of weights and measures derived from and extending the metric system of units.
Lumen , unit of luminous flux, or amount of light, defined as the amount streaming outward through one steradian a unit of solid angle, part of the volume of space illuminated by a light source from a uniform point source having an intensity of one candela. The lumen is used in….
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