Related Experiment Video
Updated: Nov 27, 2025
10:18
Blue-hazard-free Candlelight OLED
Published on: March 19, 2017
9.7K
Evaluation of Potential Optical Radiation Hazards from LED Flashlights
Robert J Landry1, Robert H James1, Sharon A Miller2
1Optical Therapeutics and Medical Nanophotonics Laboratory, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD20993.
Health Physics
|December 2, 2020
Summary
Four LED flashlights pose a moderate retinal damage risk due to high blue-light radiance, necessitating cautionary labeling. Two flashlights present a low risk, with none posing UV or thermal hazards.
Area of Science:
- Ophthalmology
- Photobiology
- Consumer Product Safety
Background:
- LED flashlights are widely used, raising concerns about potential ocular hazards from optical radiation.
- Evaluating consumer-grade LED devices is crucial for understanding light exposure risks.
Purpose of the Study:
- To assess the optical radiation safety of commercially available LED flashlights.
- To determine if these devices pose potential ocular hazards, specifically retinal damage risks.
Main Methods:
- Six LED flashlight samples were evaluated using American National Standards Institute/Illuminating Engineering Society of North America (ANSI/IESNA) Standards RP 27.1 and RP 27.3.
- Measurements focused on blue-light-weighted radiance and time to reach exposure limits.
Main Results:
- Four flashlights were classified as Risk Group 2, indicating a moderate risk of retinal damage due to high blue-light radiance.
- Two flashlights were classified as Risk Group 1, indicating a low risk of retinal damage.
- No ultraviolet (UV) radiation or retinal thermal hazards were detected in any samples.
Conclusions:
- Cautionary labeling is recommended for LED flashlights in Risk Group 2 and above, as per RP 27.3.
- Consumers should be aware of potential blue-light risks associated with certain handheld light sources.
More Related Videos
Related Concept Videos
01:23Photoluminescence: Fluorescence and Phosphorescence
3.0K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
3.0K
01:26Variables Affecting Phosphorescence and Fluorescence
974
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
974