Blacklight (BL)
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BL (blacklight) fluorescent tubes feature white glass that transmits both UV-A radiation and some visible light. These lamps are the standard choice for bug zappers, insect traps, and pest control devices that use UV-A light to attract flying insects.
Common designations include F15T8/BL and 350BL types. BL tubes are also used for industrial inspection, leak detection, and quality control applications where UV-A fluorescence reveals otherwise invisible markings or contaminants.