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Is all light equally damaging?


No.  Light in the U.V. range is generally about 10 times more damaging than visible light.  Sunlight is a mixture of U.V., visible, and infrared light.  Fluorescent bulbs emit both U.V. and visible light, while incandescent bulbs emit only visible light.

Parenterals magazine states,  “According to Planks theory, the energy per photon increases as the wavelength of light decreases.  The wavelength of visible light is 380-780 nanometers (nm, one billionth of a meter); the UV range is 185-380 nm.  Thus, the photodegradation of drugs in solution is more rapid in ultraviolet than visible light.” (Copy available on request.)