Illuminance calculator

Author: a | 2025-04-24

Illuminance Calculation. This calculator provides the calculation of illuminance for lighting applications. Explanation. Calculation Example: Illuminance is a measure of the amount of light falling on a surface. It is calculated by dividing the luminous flux (L) of the light source by the area (A) of the illuminated surface.

Lux Calculation Formula Illuminance Calculator

07 Oct 2024 Tags: Electrical Engineering Illumination Engineering Light and illumination calculation Illumination Calculation Popularity: ⭐⭐⭐Illuminance CalculationThis calculator provides the calculation of illuminance for a given room.ExplanationCalculation Example: Illuminance is a measure of the amount of light that falls on a surface. It is measured in lux (lx). The illuminance at a point is determined by the luminous efficacy of the light source, the wattage of the light source, and the area and height of the room.Q: What is the difference between illuminance and luminous flux?A: Illuminance is a measure of the amount of light that falls on a surface, while luminous flux is a measure of the total amount of light emitted by a light source. Illuminance is measured in lux, while luminous flux is measured in lumens.Q: How does the height of a ceiling affect the illuminance of a room?A: The height of a ceiling affects the illuminance of a room because it changes the distance between the light source and the surface being illuminated. The higher the ceiling, the lower the illuminance.Variables Symbol Name Unit L Room Length m W Room Width m H Ceiling Height m LR Luminous Efficacy lm/W M Wattage W LL Desired Light Level lx Calculation ExpressionRoom Area: The area of the room is given by A = L * W.Room Volume: The volume of the room is given by V = A * H.Illuminance: The illuminance is given by E = (M * LR) / (A * H).CalculatorRoom Length (m): Room Width (m): Ceiling Height (m): Luminous Efficacy (lm/W): Wattage (W): Desired Light Level (lx): Calculated valuesConsidering these as variable values: LL=500.0, LR=100.0, W=4.0, H=3.0, L=6.0, M=100.0, the calculated value(s) are given in table below Derived Variable Value Room Volume 72.0 Room Area 24.0 Illuminance 138.8889 Sensitivity Analysis GraphsRoom Area: The area of the room is given by A = L * W.Impact of null on Room Area TGvar = [-23996.000 TO 24004.000] f(TGvar)=L * TGvar Impact of null on Room Area TGvar = [-23994.000 TO 24006.000] f(TGvar)=TGvar * W Similar Calculators Illuminance Calculations for Lighting Design Illuminance Calculations in Illumination Engineering Calculating Illumination Current Illumination Function Calculators Photographic Light Intensity Calculation Illuminance Calculation in Lighting Design Illumination Fixture Calculation Fixture Wattage Calculation for Illumination Design Illumination Fixture Wattage Calculation Tool Illumination Power CalculationExplore Lighting design Photometry Interior design A room measures 10m x 5m with a height of 3m. Calculate the Enter the power in watts, luminous efficacy in lumens per watt, surface area in square feet / meters or spherical radius in feet / meters and press the Calculate button to get the illuminance in lux: Lux to watts calculator ► * the predefined luminous efficacy values are typical / average values. Watts to lux calculation formula Watts to lux calculation with area in square feet The illuminance Ev in lux (lx) is equal to 10.76391 times the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W) divided by the surface area A in square feet (ft2): Ev(lx) = 10.76391 × P(W) × η(lm/W) / A(ft2) Watts to lux calculation with area in square meters The illuminance Ev in lux (lx) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W) divided by the surface area A in square meters (m2): Ev(lx) = P(W) × η(lm/W) / A(m2) Watts to lux calculation ►

Moon Illumination Calculator - A.Tools

To be measured via a light sensor. However, these are usually not calibrated and have strong deviations compared to professional luxmeters. Good to know:Calibrated lux meters should be used to correctly measure illuminance. The measuring head must be aligned parallel to the measuring surface and ideally rest on it. Because the photometer measures all the light incident at this point, care must be taken that the person taking the measurement does not block any luminaire in the measuring field! How can illuminance be calculated? The mean horizontal illuminance Em is calculated from the luminous flux Φ that falls on the observed surface A:illuminance (lx) = luminous flux (lm) / surface A (m2)For practical calculation with a calculator, the illuminance at a point can also be calculated via the luminous intensity. The luminous intensity can be taken from the luminous intensity distribution on the data sheet of the luminaire. The formula to be applied is:illuminance (lx) = luminous intensity (cd) / distance (m)2This formula describes the photometric law of distance: the luminous intensity in candelas (cd) is divided by the square of the distance (m) from the light emission surface to the measuring surface. It is important to note here that the light hits the target surface at right angles. What value must illuminance at the workplace have? Good lighting is important at the workplace in order to concentrate over longer periods, but also to work safely. The European standard EN 12464 specifies the lighting requirements that must be complied with:. Illuminance Calculation. This calculator provides the calculation of illuminance for lighting applications. Explanation. Calculation Example: Illuminance is a measure of the amount of light falling on a surface. It is calculated by dividing the luminous flux (L) of the light source by the area (A) of the illuminated surface.

Illuminance Calculation: How to Do?

Just be distinguished. Good to know: The illuminance generated by two or more light sources can be added together. For example, if one luminaire in an office generates illuminance of 500lx on a desk and a second one does the same, then the illuminance on the desk is 1000lx if both luminaires are operated. What is the difference between illuminance and luminance? lluminance and luminance are two important photometric parameters in lighting design. Both take into account the brightness sensitivity curve of the human eye. Illuminance is a measure of the light incident on a surface, whereas luminance describes the light reflected from it. If a white and a black sheet of paper are illuminated with the same intensity, the same illuminance will be measured on both sheets. However, the white sheet reflects significantly more light than the black sheet and thus has a higher luminance. What is point illuminance? In contrast to the nominal illuminance (Em), which gives an indication of the average illuminance of a surface, point illuminance (Ep) describes the precise illuminance at a point.Using the photometric law of distance, it is also possible to calculate the illuminance at individual points in space. Indirect lighting components are not taken into account in the calculation, but can be included via an additional calculation. Calculating point illuminances mainly plays a role in lighting design for narrowly defined areas illuminated by individual luminaires, e.g. with exhibits in an exhibition. ERCO Light Knowledge is also available as a whitepaper: Further topics The main parameters are, in addition to illuminance, luminance distribution,danger of glare,light direction,light color and color rendering,flicker, anddaylight. Illuminance table: How much lux in the workplace? Workspaces and activities Illuminance lx Tea kitchens, canteens and break rooms 200 Office: filing and copying 300 Office: writing, reading and data processing 500 Office: technical drawing by hand 750 Archives 200 Sales area 300 Checkout areas 500 Control, fine work 1000 Source: ASR A3.4 Lighting and Visual Contact, Committee for Workplaces, ASTA Management, BAuA, www.baua.de The importance of daylight was specifically emphasized in the updated DIN EN 12464-1 from 2011. In addition, it is repeatedly pointed out that lighting should be controllable or adjustable. The Committee on Workplaces supervised by the German Ministry of Labor and Social Affairs also reflects the state of scientific knowledge for occupational safety and health in the setting up and operating of workplaces: The mean illuminance in the surrounding area of a workstation with 300lx illuminance must be at least 200lx.For workstations illuminated with 500lx or more, the mean illuminance in the surrounding area must be at least 300lx.Illuminances above 500lx in workstation areas may require a higher mean illuminance in the surrounding areas.The minimum illuminance in the surrounding area must not fall below 0.5 times the mean illuminance of the surrounding area.For light visual tasks, sufficient visual performance is achieved with low illuminance levels, whereas complex visual tasks need high illuminance levels. For example, 20 lux is a bottom limit at which people's facial features can only

Methods for calculating illumination - Academia.edu

You read about illuminance on the one hand and about luminance on the other hand? And now you ask yourself: Is it the same? Or is there a difference between both terms? There are many terms used in the lighting world and often people use them interchangeably even if they have total different meanings. To stop your confusion we will tell you the exact meaning of luminance and illuminance in this article. ContentsIlluminance vs LuminanceWhat is luminous flux?What is illuminance?What is luminance?Shop Related ProductsHow do we measure illuminance and luminance?What are the differences between illuminance and luminance?ConclusionShop Related ProductsThese two terms seem to be similar at a first glance. This is why people use them interchangeably, yet the truth is that they have different meanings. This can be a cause for confusion and misunderstandings.We will distinguish between illuminance and luminance in the following paragraphs. But first, we need to take a look at another important term, the luminous flux.What is luminous flux?When buying a light bulb, you are usually concerned only about the amount of light emitted by the bulb. This amount of light is called the luminous flux or luminous power. It measures the visible light that comes from the source. The measurement used for luminous flux is the lumen.The number of lumens produced by a lighting fixture determines its brightness. But when choosing a lighting fixture, you should not base it on its lumen output alone. The reason for this is that lumens only measure the light being emitted by the light source. It does not measure the amount of light perceived by the human eye in a given application. It can result in an inaccurate image of the performance of the fixture.In other words, the lumen output should not be the determining factor for the suitability of a lighting fixture. In order to evaluate the lighting fixture, you should measure the illuminance and the luminance.What is illuminance?Illuminance is the intensity of light falling on a surface area, such as a wall or a desk. It is not the same as the amount of light produced by a light source. The illuminance is also called incident light. This incident is the beam of light actually landing on the surface.The illuminance will be of high value if the area illuminated is close to the light source. If the light lands on a horizontal surface, such as a desk, it

How To Calculate Illuminance - Sciencing

More user friendliness for you ERCO wants to offer you the best possible service. This website stores cookies for this purpose. By continuing to use this website, you consent to the use of cookies. For more information, please read our privacy policy. If you click on "Do not agree", essential cookies will continue to be set. Certain contents of external pages can no longer be displayed. {{ tu_banner_headline }} tu_banner_copy Illuminance E as a measure of luminous flux incident per surface unit A. Illuminance (E) describes the quantity of light incident on a surface. It is the ratio of the incident luminous flux (Φ) to the size of the surface (A). The unit of measure of illuminance is lux (lx). This is defined as lumens per square meter (1lx = 1lm/m2). Illuminance recedes with the square of the distance from the light source (photometric law of distance). Overview of illuminance ERCO Light Knowledge is also available as a whitepaper: How is illuminance measured? A luxmeter or photometer is used to measure illuminance directly. A light sensor with a defined diameter measures the incident light and displays the corresponding values in lux on the device. There are different quality classes for photometers. These provide information about the tolerance of the determined values:Class A: tolerance of +/- 5%Class B: tolerance of +/- 10%Class C: tolerance of +/- 20%Therefore, only calibrated photometers of high quality are used in professional lighting technology. There are various apps available for smartphone devices that also enable illuminance. Illuminance Calculation. This calculator provides the calculation of illuminance for lighting applications. Explanation. Calculation Example: Illuminance is a measure of the amount of light falling on a surface. It is calculated by dividing the luminous flux (L) of the light source by the area (A) of the illuminated surface.

Luminaire Calculation for Desired Illuminance

Not look at the sun directly for a very long time.What are the differences between illuminance and luminance?Illuminance is not seen by the human eye, but luminance is. Your ability to see is affected by the amount of light delivered into the space and the reflection of the surfaces in the space. Illuminance measures the incident of light or the light illuminating a surface, while luminance measures what is reflected from the surface.Illuminance measures light hitting a surface and luminance measures light coming from a surface to our eyes. Why do we need 2 different quantities for them?Illuminance is independent of the surface. Whether it is hitting a desk or a wall, the illuminance is the same. Luminance is dependent on the surface. Since different objects have different reflection or refraction rates, luminance will differ between them.Illuminance does not depend on the number of light sources; the direction from which the light comes; the position of the light sources; and the type of surface on which it falls. Whether the surface is a polished steel plate or a piece of black felt cloth, the illuminance remains the same.On the other hand, all the quantities that illuminance is independent of, is needed to measure luminance. This includes the direction from which the light reaches the surface, the angle from which the light is viewed, and the properties that different objects have in themselves.ConclusionWe hope you now know there is a difference between illuminance and luminance and even understand what these two terms mean. The main differentiator you could remember is the dependence of the surface. If you compare the luminance of the surface of a polished steel plate and the luminance of the surface of a black felt cloth, you can easily tell that luminance on the surface of a polished steel cloth is higher.