Most of us are familiar with the special effect of what we commonly call black lights -- when everything else is dark, a black light makes certain objects glow in the dark. This is because certain objects "fluoresce" under ultraviolet (UV) light, which is what a black light emits.

But when we talk about black lights, many of us are actually referring to what the lighting industry calls a "blacklight blue" bulb (BLB). There are differences between these and what the industry calls a true black light (BL). This article explores those differences.

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