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 USA/Canada 120V/60Hz, 277V/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.

Mesopic vision (twilight vision): Definition

Mesopic vision: Representation of the sky at twilight.

Mesopic vision is the transitional state from seeing by day (photopic vision) using the cones, to seeing by night (scotopic vision) using the rods. This is why it is also called twilight vision. Upon decreasing brightness, our colour perception and visual acuity deteriorate until we finally only recognise differences in brightness.

Good to know:

Experts speak of mesopic vision between luminances of 3 cd/m2 and 0.01 cd/m2.

Would you like to find out more?

Further topics on seeing and perceiving

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.