Rafael Lazar

PhD student, Psychologist

“How does light influence human physiology, mental health and performance?” My main interests lie in the spectral composition of light, how it can be used (or not used) to enhance sleep, performance, and well-being and what we can do to live a healthy, sustainable lifestyle in a post-modern world.



Lazar, R.; Degen, J.; Fiechter, A-S.; Monticelli, A.; Spitschan, M.

Regulation of pupil size in natural vision across the human lifespan Journal Article

In: R. Soc. Open Sci, vol. 11, pp. 191613, 2024.

Links | BibTeX


Siraji, Mushfiqul Anwar; Lazar, R.; van Duijnhoven, Juliëtte; Schlangen, Luc J M; Haque, Shamsul; Kalavally, Vineetha; Vetter, Céline; Glickman, Gena L; Smolders, Karin C H J; Spitschan, Manuel

An inventory of human light exposure behaviour Journal Article

In: Sci Rep, vol. 13, no. 1, pp. 22151, 2023, ISSN: 2045-2322.

Abstract | Links | BibTeX

Stampfli, J. R.; Schrader, B.; di Battista, C.; Häfliger, R.; Schälli, O.; Wichmann, G.; Zumbühl, C.; Blattner, P.; Cajochen, C.; Lazar, R.; Spitschan, M.

The Light-Dosimeter: A new device to help advance research on the non-visual responses to light Journal Article

In: Lighting Research & Technology, 2023.

Links | BibTeX


Lazar, R.

Light flash therapy in the wild Journal Article

In: Nature Reviews Psychology, 2022, ISSN: 2731-0574.

Abstract | Links | BibTeX


Spitschan, M.; Lazar, R.; Yetik, E.; Cajochen, C.

No evidence for an S cone contribution to acute neuroendocrine and alerting responses to light Journal Article

In: Current Biology, 2019.

Links | BibTeX

Spitschan, M.; Lazar, R.; Cajochen, C.

Visual and non-visual properties of filters manipulating short-wavelength light Journal Article

In: Ophthalmic Physiol Opt, 2019.

Links | BibTeX