UV flashlight black light, also known as UV-A lamp, Wood's lamp or UV flashlight, is a lamp that emits long wave (UV-A) ultraviolet light and very little visible light. Ultraviolet rays are invisible to the human eye, but illuminatingcertain materials with ultraviolet rays will produce visible light, making these materials emit light of various colors. This is called fluorescence and has many practical uses. Because other types of UV flashlight emits visible light, which submerges the dim fluorescence, black light is needed to observe the fluorescence.
One type of UV flashlight black light has a violet filter material on the bulb or in the separate glass filter in the lampshade, which can block most of the visible light and allow it to pass through the UV light, so the lamp will emit weak purple light when working. The UV flashlight black lights have this filter. The filter has a lighting industry name, including the letters BLB. This represents "black light blue". The second type of lamp produces ultraviolet light, but has no filter material, so it produces more visible light and has a blue color when working. These tubes are used for "bug zapper" and insect catcher, and are identified by the industry name "BL". This represents "black light".
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