Like all fluorescent lamps, LP (low pressure) tanning lamps have a ballast to start the lamps. This limits the flow of current and the plasma of excited mercury atoms inside the tanning tube emits ultraviolet light directly. The lamps are coated on the inside with special phosphors. Unlike HP (high pressure) lamps, the glass that is used in low pressure lamps filters out all UVC. Once the plasma is fully formed, it literally strips away the outer electrons from the mercury; when these electrons return to a lower energy level, visible and UV light is emitted. Some of the short-wave ultraviolet excites the phosphors, which then emits photons in the proper spectrum for tanning.
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