Viewing glasses improve observed contrast. Yellow filter glasses are suitable for UV flashlights and lanterns, orange ("blue blocking") glasses are required for use with Blue wavelengths. 

Safety note: Although many clear glasses claim "UV Protection", most of our flashlights are sufficiently powerful that the glasses offer little or no protection from UV radiation to the eye. Please verify blocking effectiveness by placing the glasses in the beam between flashlight and a fluorescent target and observing that fluorescence is extinguished.

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