Chipp:You have touched on the primary difference between tanning indoors and outdoors.In your booth (or sunbed), you control all of the variables and so your clients get (approximately) the same dose of UVR each time they tan.To use your analogy, it makes a difference whether you spend 3 hours from 6:00 am to 9:00 am or Noon to 3:00 pm in the sun "on the beach in Miami". You won't tan much early in the morning and you might be overexposed (sunburn) if you tan at noon.Also, a comment about the relative merits of sunbeds and booths. Booths provide the most even tan because the client can position themself in the middle of the irradiance from the
lamps and there are no pressure anoxia problems. However, when you have had a long, hard day, the idea of standing up for 10 or 12 minutes isn't too appealing.Different strokes for different folks!Don