Illuminance Converter

Illuminance calculator - lux, foot candile, luminous flux

Illuminance, i.e. light illumination, describes how much light actually reaches a given point on the surface. Our illuminance calculator helps you quickly convert lux to foot candyle, calculate E from the equation E = Φ / S, and better understand whether a room is lit as recommended.

Run the Illuminance Calculator See questions and answers

Illuminance Calculator Lux to foot candy converter Light illumination E = Φ / S Room illumination calculator Lighting unit converter

What is light illumination

Light illumination, also called illuminance, describes the amount of light falling on a given surface. The light source can be both natural light from windows and artificial lighting from lamps, LED fixtures, light bulbs or reflectors. In practice, we simply talk about how bright it is on the desk, floor, workstation or road.

Formally, the illuminance E is given by the formula:

E = Φ / S

where:
E - illumination intensity
Φ - luminous flux [lumens, lm]
S - illuminated area [square meters, m²]

So if you know the luminous flux of the fixture and the size of the illuminated area, you can calculate the average illuminance in lux. The illuminance calculator performs this calculation automatically and helps you interpret the result.

Illumination units - lux and foot candile

In the SI system, the unit of illuminance is lux (lx). One lux is the illuminance produced when a luminous flux of 1 lumen uniformly illuminates an area of ​​1 m².

In the foot system, the foot candle unit is used. One foot candyla corresponds to the illuminance over an area of ​​1 square foot illuminated by a luminous flux of 1 lumen. The relationship between these units is as follows:

1 foot candle ≈ 10.76 lux 1 lux ≈ 0.0929 foot candle

Our lux to candyl foot and candyl foot to lux converter takes these relationships into account and automatically converts the results, so you don't have to remember the coefficient values.

How the Illuminance Calculator works

The Illuminance Calculator can operate in two main modes:

• calculating illuminance from the equation E = Φ / S,
• converting illuminance units between lux and foot candy.

Mode 1 - calculating E from the equation E = Φ / S

1. Enter the luminous flux Φ
   Enter the value of the luminous flux in lumens, for example the total value for several lighting fixtures in one room.
2. Enter the area S
   Enter the size of the illuminated area in square meters, for example the area of ​​an office, warehouse, work table or part of a corridor.
3. Read the result in lux
   The illuminance calculator will calculate the E value in lux and can additionally indicate whether it is within the typical range for a given type of room (e.g. office, corridor, warehouse).

Mode 2 - conversion of lux to foot candy and vice versa

1. Select the input unit
   Select whether the entered value is given in lux (lx) or foot candy (fc).
2. Enter the illuminance value
   Enter a number, e.g.300 lxor50 fc.
3. Select the output unit
   Specify whether you want the result in lux or foot candylls, and the calculator will convert the value using the factor 1 fc = 10.76 lx.

Examples of using the Illuminance Calculator

Example 1 - calculating the illuminance on a desk

You have a lamp with a luminous flux