Summary
This study re-analyzes and publishes data from a 30-participant human subject study (Novotny et al., 2013) examining whether the size of a luminous surface (small vs. large area) differentially suppresses melatonin secretion as a proxy for circadian impact. The experimental setup was reconstructed in an LED test room at TU Berlin to better characterize the light stimulus parameters, including the angle of light incidence on the eye, providing guidance for circadian-effective luminaire design.
Key Findings
- A trend was observed suggesting that larger luminous surfaces suppress melatonin more than smaller surfaces under the tested conditions, first identified in a 6-participant pilot study (2010) and re-examined with 30 participants (2013).
- Salivary melatonin sampling was used to assess suppression; results indicate luminaire surface area may be a relevant design parameter for non-visual (circadian) lighting effects.
- The angle of light incidence on the observer's eye was identified as an additional factor requiring consideration when characterizing circadian light stimuli.
Categories
Sleep & Circadian Health: Investigates melatonin suppression as a measure of non-visual light effects, examining how luminaire size influences circadian responses.
The Science of Light: Focuses on ipRGC/melanopsin photoreceptor biology and the characterization of light stimuli for non-visual effects, including melanopic metrics.
Author(s)
L Thelen, P Novotny, DIK Broszio, M Knoop
Publication Year
2019
Related Publications
Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The two‐process model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice