Photobiological Safety Evaluation of UV Nail Lamps

We evaluated six UV nail lamps representative of major US manufacturers to evaluate radiant hazards as defined in ANSI/IESNA RP-27 Recommended Practice for Photobiological Safety. Lamps were evaluated at three positions, 1cm above the inner surface approximating exposure to the hand and the 20cm RP-27 non-general light source distance, oriented normal and 45 degrees to the opening. Hazard to skin at intended use distance classified these devices into Risk Group 1 or 2 (Low to Moderate) with S() weighted Actinic UV ranging 1.2-1.7Wcm(-2) and 29.8-276.25min permissible daily exposure. At 20cm on center and 45 degrees UV risk to skin and eyes were all within Exempt classification. Actinic UV ranged 0.001-0.078Wcm(-2) and unweighted near UV (320-400nm) ranged 0.001-0.483mWcm(-2). Likewise the retinal photochemical blue light hazard and retinal thermal and cornea/lens IR were also Exempt. One device had aphakic eye hazard slightly rising into Risk Group 1 (Low). There were no other photobiological risks to normal individuals. Total exposure following programmed times and steps accumulate to only a small fraction of RP-27 permissible daily occupational exposure. These risks are further mitigated in realistic nonoccupational use scenarios as it is unlikely to be a daily occurrence.