Blue-Light Hazard of Light-Emitting Diodes Assessed with Gaussian Functions

Stefan Bauer
Additional contact information
Stefan Bauer: Federal Institute for Occupational Safety and Health (BAuA), 44149 Dortmund, Germany

IJERPH, 2021, vol. 18, issue 2, 1-18

Abstract: The high blue proportion of phosphor-conversion white-light emitting diodes (pc-LEDs), especially of those with higher correlated color temperatures (CCT), raises concern about photochemically induced retinal damages. Although almost all general lighting service LEDs are safe, other applications exist, like spotlights for theatres or at construction sites, that can pose a severe blue-light hazard (BLH) risk, and their photobiological safety must be assessed. Because of required but challenging radiance measurements, a calculative approach can be supportive for risk assessment. It is the aim of this work to exploit Gaussian functions to study LED parameter variations affecting BLH exposure. Gaussian curve approximations for color LEDs, the BLH action spectrum, and the spectral luminous efficiency for photopic vision enabled analytically solving the BLH efficiency, η B , and the BLH efficacy of luminous radiation, K B , v . It was found that sigmoidal functions describe the CCT dependence of η B and K B , v for different color LEDs with equal spectral bandwidth. Regarding pc-LEDs, variations of peak wavelengths, intensities, and bandwidths led to linear or parabolic shaped chromaticity coordinate correlations. η B and K B , v showed pronounced CCT dependent extrema that might be exploited to reduce BLH. Finally, an experimental test of the presented Gaussian approach yielded its successful applicability for color and pc-LEDs but a minor accuracy for blue and green LEDs.

Keywords: light-emitting diode (LED); blue-light hazard (BLH); photobiological safety; risk assessment; BLH efficiency; BLH efficacy of luminous radiation; chromaticity coordinates; correlated color temperature (CCT) (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/18/2/680/pdf (application/pdf)
https://www.mdpi.com/1660-4601/18/2/680/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:18:y:2021:i:2:p:680-:d:480549

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().