Format

Send to

Choose Destination
See comment in PubMed Commons below
J Circadian Rhythms. 2010 Feb 13;8(1):2. doi: 10.1186/1740-3391-8-2.

Circadian light.

Author information

  • 1Lighting Research Center, Rensselaer Polytechnic Institute, 21 Union Street, Troy, NY 12180, USA. ream@rpi.edu.

Abstract

The present paper reflects a work in progress toward a definition of circadian light, one that should be informed by the thoughtful, century-old evolution of our present definition of light as a stimulus for the human visual system. This work in progress is based upon the functional relationship between optical radiation and its effects on nocturnal melatonin suppression, in large part because the basic data are available in the literature. Discussed here are the fundamental differences between responses by the visual and circadian systems to optical radiation. Brief reviews of photometry, colorimetry, and brightness perception are presented as a foundation for the discussion of circadian light. Finally, circadian light (CLA) and circadian stimulus (CS) calculation procedures based on a published mathematical model of human circadian phototransduction are presented with an example.

PMID:
20377841
PMCID:
PMC2851666
DOI:
10.1186/1740-3391-8-2
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Ubiquity Press Icon for PubMed Central
    Loading ...
    Support Center