Document Type
Report
Publisher
Utah State University
Publication Date
2023
First Page
1
Last Page
3
Abstract
High pressure sodium lamps have a low fraction of blue photons, and this fraction is reduced from 3.6% to 2.6% in the newer style double-ended bulbs. About half of the photons in the “blue” region (400 to 499 nm) are between 491 and 499 nm. These photons have low biological activity for cryptochrome activation.
Recommended Citation
Liu, Jun and Bugbee, Bruce, "Differences in the Spectral Output of Single- and Double-Ended High-Pressure-Sodium Lamps" (2023). Photobiology. Paper 1.
https://digitalcommons.usu.edu/cpl_photobiology/1