Blacklight (BL) lamps are made with a special glass that filters out most visible light. Blacklights instead emit a specific type of ultraviolet light called UVA. Blacklights are good for making certain substances glow that would normally be invisible.
Blacklight Blue (BLB) lamps are designed with a special deep-blue glass that does a better job of filtering out visible light than regular blacklights, producing the maximum amount of ultraviolet light possible.
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