Definition of absolute luminance threshold

LIVE WEDNESDAY: Six new webinars on the latest innovations and applications in polymer optics.

Suppliers Products Categories Handbook Dictionary Careers
Resources Photonics Spectra BioPhotonics Vision Spectra Virtual Events & Summits Educational Institutions Add/Update Your Listing Exhibitor Listing Portal Become an Exhibitor Buyers' Guide Print Edition Marketplace Help
Subscribe Advertise

Suppliers Products Categories Handbook Dictionary Careers

Resources

Photonics Spectra BioPhotonics Vision Spectra Virtual Events & Summits Educational Institutions Add/Update Your Listing Exhibitor Listing Portal Become an Exhibitor Buyers' Guide Print Edition Marketplace Help

Excelitas PCO GmbH - PCO.Edge 11-24 BIO LB

Photonics Dictionary

absolute luminance threshold: The absolute luminance threshold is the lowest luminance level of a light source or illuminated object that can be detected by the human eye under specific conditions. This threshold represents the point at which a stimulus becomes just barely visible against a completely dark background.

Luminance level: It quantifies the smallest amount of light (measured in units such as candelas per square meter, cd/m²) that can be detected by the average human eye.

Measurement conditions: The absolute luminance threshold is typically measured under controlled conditions in a dark environment to eliminate any background light that might interfere with detection.

Influencing factors:

Adaptation state: The threshold can vary depending on whether the eyes are adapted to darkness (dark-adapted) or to light (light-adapted).

Age and health: The sensitivity of the visual system can be affected by age, eye health, and individual differences.

Wavelength: The threshold can vary with the wavelength of the light; the human eye is more sensitive to certain wavelengths (e.g., green light) than others (e.g., red or blue light).

Understanding the absolute luminance threshold is important in various fields such as:

Lighting design: Ensuring adequate illumination in environments to meet visibility requirements.

Safety and signage: Designing signs and signals that are visible under low-light conditions.

Vision research: Studying the limits of human visual perception and diagnosing vision impairments.

In a dark room experiment, a small light source gradually increases in brightness. The absolute luminance threshold is reached at the point when a participant first reports seeing the light. For example, this might be at a luminance level of 0.001 cd/m² for a dark-adapted eye.

PowerPhotonic Ltd. - Bessel Beam Generator MR 6/24

Lambda Research Optics, Inc. - Beamsplitter Cubes

Popular Articles

SEMI Global Headquarters - SCJ 2024 MR 11/24

Explore Our Content
News
Features
Latest Products
Webinars
White Papers
All Things Photonics Podcast
Photonics Spectra Now
Videos
Our Summits & Conferences
Industry Events
Bookstore

Join Our Community
Subscribe
Advertise
Become a member
Sign in
Contribute a Feature
Suggest a Webinar
Submit a Press Release
Mobile Apps

About Us
Our Company
Our Publications
Contact Us
Career Opportunities
Teddi C. Laurin Scholarship

Terms & Conditions
Privacy Policy
California Consumer Privacy Act (CCPA)

Requesting information about:

* First Name:

* Last Name:

* Email Address:

* Company:

* Country:

Message:

When you click "Send Request", we will record and send your personal contact information to the supplier by email so they may respond directly. You also agree that Photonics Media may contact you with information related to this inquiry, and that you have read and accept our Privacy Policy and Terms and Conditions of Use.

* Required

We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.