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4 med is "4 times the minimum amount of time required to cause initial reddening of the skin" known as "erythemal" This is the max dose for tanning machines.The starting session or first session is usually shorten to 1/2 or 1 med "the minimum amount of time required to cause initial reddening of the skin the first sign of erythemal of the skin, then tanning time is increased till you hit 4 med the beds max exposure time.The maximum dose any tanning machine is allowed to deliverer for its maximum session length is 4 med. This is how maximum exposures are determined for each tanning machine, when the machine is designed.This is so that one machine will not burn or over expose you to dangerous exposures and other tanning machines will not be ineffective for their given exposure schedules.This is why some machines have 7 minimum. sessions some have 10 some have 15 some have 20 some have 30 maximum sessions exposures, its the time it takes to reach 4 med for different beds.That the design, number of lamps, wattage of lamps, uva/uva content, closeness to lamps, etc. will determine how many minutes it will take for the dose to hit 4 med. its maximum exposure time.Example a 10 min max exposure bed will provide a dose of 4 med in ten min. and a 20 min max exposure bed will take 20 before you get the dose of 4 med. You are not receiving double the tanning effect in the 20 min bed it just takes twice as long to get the same dose.Were as a 30 min max exposure tanning bed will take longer again to reach the max dose of 4 med. You are not getting 3 time the dose in a 30 min. bed as you would in a 10 min. bed.wow that was a mouth full :-)
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