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To the mobile version
lx = lm m-2
fc = lm ft-2
lm in-2
W m-2 at 555 nm (see below)

Rounding: significant digits.
Decimal sign:

Illumination is the density of luminous flux on a surface.

ATTENTION: The conversion of illumination to Watt and vice versa is defined only for monochromatic light of a frequency of 540·1012Hz corresponding to about 555 nm. At all other wavelengths you would get wrong results.

Usage: Type the value of illumination you want to convert into the field, behind which you find the the unit. Click on the corresponding button and read the results in the other fields. Use the "reset" button to reset your calculation. Move the mouse over a unit or click on it to read its full name.

Example: You want to convert 100 footcandle, respectively lumen/feet2 into "Lux". Type "100" into the field in front of "lm/ft2". Click on any empty space in the window or on the "calculate" button. Find your result in the "lx" field (1076.4 Lux).

- Please note the remarks about the representation of numbers..
- There is no warranty for the calculation. Cactus2000 is not responsible for damage of any kind caused by wrong results.
- Please send an email if you have suggestions or if you would like to see more conversions to be included.

© Bernd Krüger, 11.02.2002, 26.08.2018

Bernd Krüger, 2022