3.4.3. MED/Sunburn Test: This procedure involves exposing eight 6mm areas of skin over increasing doses of simulated solar radiation (SSR), while the rest of the body is draped. SSR is delivered by a 1,000-Watt xenon arc lamp, which emits ultraviolet wavelengths from 290-400 nm, closely resembling natural sunlight. The minimal erythema dose (MED) will be determined approximately 24 hours after initial exposure by using a chromameter that records the values of redness associated with each exposed 1cm area. The overall differences in MED between the subjects will be assessed.