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The potential 'blue light hazard' from LED headlamps.

Richard B Price1, Daniel Labrie2, Braden Sullivan1

  • 1Department of Dental Clinical Sciences, Division of Prosthodontics, Faculty of Dentistry, Dalhousie University, 5981 University Ave., P.O. BOX 15000, Halifax, Nova Scotia B3H 4R2, Canada.

Journal of Dentistry
|July 25, 2022
PubMed
Summary

Dental personnel using light-emitting diode (LED) headlamps face a potential blue light hazard. Direct viewing of some LED headlamps can exceed safe exposure limits, but reflected light is safe, and protective eyewear can mitigate risks.

Keywords:
Blue light hazardHeadlampsLight-emitting diodeOccupational hazard

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Dental Technology

Background:

  • Dental professionals frequently use light-emitting diode (LED) headlamps for extended periods.
  • The potential risk of retinal blue light hazard from these white light sources is not well understood.

Purpose of the Study:

  • To quantify the blue light hazard associated with direct and indirect viewing of LED headlamps used in dentistry.
  • To compare the hazard levels of LED headlamps with traditional halogen headlamps and LED curing lights.

Main Methods:

  • Spectral radiant power measurements were conducted using integrating spheres and spectroradiometers.
  • Measurements included direct and indirect viewing of various light sources at a 35 cm distance.
  • Maximum daily exposure times (tMAX) were calculated based on blue-weighted irradiance values.

Main Results:

  • LED headlamps exhibited varied radiant powers, spectra, and color temperatures, with powers ranging from 47 mW (halogen) to 378 mW (LED).
  • Direct viewing of some LED headlamps presented a higher blue light hazard than LED curing lights, with tMAX as low as 53 seconds.
  • Reflected light from LED headlamps off a white surface did not exceed safe exposure limits, even with a blue dental dam.

Conclusions:

  • White light LED headlamps increase the retinal blue light hazard compared to halogen sources.
  • Direct viewing of certain LED headlamps poses a hazard, with maximum exposure times potentially reached rapidly.
  • Reflected light from dental LED headlamps is safe for healthy adults, and direct viewing hazards can be managed with protective eyewear.