SED 3
SED 3 :
A symbol for standard erythemal dose, a unit used to measure the amount of skin-reddening ultraviolet radiation received by a person in the sun or in a tanning salon. One SED is equal to a dose of 100 joules per square meter (J/m2) of skin surface. The radiation producing skin reddening is confined to a narrow range of wavelengths around 300 nanometers, so the energy is measured only in these wavelengths using a standardized procedure. A tanning rate of one SED per hour is equivalent to 27.778 milliwatts per square meter (mW/m2) of skin surface
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