The clear shields on a tanning bed are called acrylics because they are made from a 100% acrylic compound. It is a common mistake to call them plexiglass, which is a very different plastic that will block the majority of UV rays, while pure acrylic transmit the majority of UV in all frequencies. These shields break down over time as they.
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Like all fluorescent lamps (and other plasma devices such as neon lamps), low pressure tanning lamps work when the ballast directs enough energy to the lamp that a plasma is generated inside the lamp. The lamps are coated on the inside with special phosphors and contain a small amount of mercury (20mg typical). Unlike high pressure lamps, the glass that is used in low pressure lamps automatically filters out all UVC. Once the plasma is fully flowing (less than one second), the plasma literally strips away the outer electrons from the mercury, sending them into the phosphor, which produces photons in the proper spectrum for tanning. The electrons, now in a lower energy state, will jump back into place onto the first mercury atom they find with.