The Sun Angel works by scanning the most exposed area of your skin (the forehead) and the least exposed (back of arm or back of upper thigh). The resulting calculation calibrates the behaviour of the lamps to suit your skin type. You must ensure that the areas scanned do not have birth marks, freckling or cosmetics.
You need to enter the bed within three minutes of the scan and as such, it is advisable to apply your lotion first leaving the areas to be scanned clear. You can then apply lotion to just these areas after you have scanned your skin. Enter the bed, pull down the canopy, adjust the facial lamps and fans to suit your preferences and enjoy your session!