myERCO
myERCO
Your free myERCO account allows you to mark items, create product lists for your projects and request quotes. You also have continuous access to all ERCO media in the download area.
You have collected articles in your watchlist
Technical environment
Technical environment
Global standard 220V-240V/50Hz-60Hz
Standard for USA/Canada 120V/60Hz, 277V/60Hz
  • 中文

Our contents are shown to you in English. Product data is displayed for a technical region using 220V-240V/50Hz-60Hz.

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.

Light intensity

Light intensity

Unit: candela (cd)
The light intensity is the luminous flux per solid angle (lm/sr). The spatial distribution of the light intensity of a light source is shown by the light intensity distribution curve.

An ideal, point light source radiates its luminous flux evenly in all directions in the room, with its light intensity being equal in all directions. In practice, however, there is always an uneven spatial distribution of luminous flux, partly due to the lamp design and partly due to the manner in which the luminaire is formed. The Candela, as the unit of light intensity, is the basic unit of lighting engineering from which all other lighting engineering values are derived.

Light intensity Light intensity Light intensity Light intensity Light intensity Light intensity

Representation

The spatial distribution of the light intensity of a light source results in a three-dimensional body of light intensity distribution. A section through this light intensity body will give the light intensity distribution curve, which describes the light intensity distribution in one plane. The light intensity is, usually displayed in a polar co-ordinate system as a function of the emission angle. To enable direct comparison of the light intensity distribution of different light sources, the values are expressed in relation to 1000 lm luminous flux. With rotationally symmetrical luminaires, a single light intensity distribution curve is sufficient to describe the luminaire. Axially symmetrical luminaires need two curves, although, these can usually be represented on one diagram.

Would you like to find out more?

Further topics on photometry

Do you need further information?

You can contact your regional contact partner via:

You can gladly send us an e-mail or ask your question here

Your data will be handled confidentially. For further information see Data protection declaration.

ERCO Newsletter - inspiring projects, new products and fresh lighting knowledge

Subscribe to the newsletter
Your data will be handled confidentially. For further information see Data protection declaration
From now on, for convenience and speed, we will be emailing the ERCO Newsletter in a digital format on a regular basis to help you keep up with the latest news from ERCO. We aim to ensure that you’re updated about events, awards, fresh lighting knowledge, project reports and product news along with reports from the lighting and architectural sectors. The publication is free and you can unsubscribe at any time.