The ProSun Azure Tanning Bed is pretty safe.
ProSun Azure Tanning Bed only uses 120V.
You can get half sized tanning beds from specialty stores.
coal
By smoothest do you mean the least damaging to your lungs ?
There are two basic types of spray tanning products. One type is done at a professional tanning salon where you enter a booth or have a person spray the tanning product onto you. The other type is a spray tanning product you apply yourself at home. Home based spray tanning products can be tricky to apply and can be a bit messy. There are also tanning creams you can apply at home which can be a bit easier to apply. Clarins Self Tanning Instant Gel and Jergens Natural Glow Revitalizing Daily Moisturizer had the best reviews on Consumer Reports for home tanning products.
Hollywood Tans offers both UV and UV-less tanning options to their clients. They have at least 3 different tanning options for their customers. http://www.hollywoodtans.com/
There are many different tanning lotions to choose from. If you are fair skinned and need protection from the sun then you need to get a spf of at least 50 to keep from burning.
Wind.
Daytime
I would hazard a guess, out of all the major sports, that golf would be the least damaging, as long as you do it right.
There are many risks to spray tanning, not the least of which affect the hormonal balance of women and the eventual damage of DNA. Damaged DNA may mutate after time, causing tumors to spread.
If you have been tanning with a basic accelerator or intensifier then you can bath immediately after tanning without hindering your tanning results. If you have been tanning with a lotion containing tingle then it is recommended you wait at least a few hours after exposure. A shower can actually increase the tingle sensation to an uncomfortable level. Finally if you are tanning with a product containing bronzers or a color guide then it is recommended that you wait about 4 hours before bathing. DHA bronzers are continuing to work and bathing can halt the process.