Tanning beds are electrically powered devices that use specialized lamps to emit ultraviolet (UV) radiation, mimicking the sun’s rays to darken your skin indoors. They typically look like a clamshell-shaped pod with UV lamps lining both the top lid and the bottom base, though some models are upright booths you stand in. The U.S. FDA classifies them as class II medical devices, meaning they require special controls, premarket review, and mandatory warning labels.
How Tanning Beds Produce UV Light
The lamps inside a tanning bed emit two types of ultraviolet radiation: UVA and UVB. Most commercial tanning beds are heavily weighted toward UVA, with lamps typically producing 95% to 98% UVA and only 2% to 5% UVB. Home tanning beds usually come equipped with lamps in the 5% to 6.5% UVB range, a level chosen because it’s less likely to cause immediate burns for most skin types.
This ratio matters because UVA and UVB affect your skin differently. UVB is the wavelength responsible for sunburns and direct DNA damage to the outer layer of skin. UVA penetrates deeper, reaching into the lower layers where it generates unstable molecules called reactive oxygen species. These molecules trigger a chain reaction that breaks down the structural proteins keeping skin firm and smooth.
How UV Light Darkens Your Skin
Your skin contains specialized cells called melanocytes, which produce the pigment melanin. When UV light hits these cells, it activates a light-sensitive receptor on their surface, triggering a rapid release of calcium inside the cell. That calcium signal kicks off a cascade that ramps up melanin production. The melanin then spreads into surrounding skin cells, absorbing future UV radiation like a shield and giving skin its darker appearance.
UVA produces an almost immediate darkening effect by oxidizing melanin that’s already present in your skin. UVB stimulates new melanin production, which takes longer to develop but lasts longer. Because tanning beds deliver far more UVA than UVB, the tan you get from a bed tends to develop quickly but also fades relatively fast compared to a sun-derived tan.
Types of Tanning Beds
There are two main categories, defined by the type of lamp they use.
Low-pressure beds use long fluorescent tubes, the kind you’d recognize from most commercial tanning salons. These emit a mix of UVA and UVB, with the exact ratio depending on the specific lamp installed. They’re the most common type and generally require sessions of 10 to 20 minutes.
High-pressure beds use compact quartz lamps paired with special glass filters that block nearly all UVB while concentrating UVA output. Because UVA doesn’t burn as easily, sessions can sometimes be shorter. High-pressure beds are marketed as producing a deeper, longer-lasting tan with less burn risk, though the concentrated UVA still causes significant damage beneath the skin’s surface.
Skin Cancer and Melanoma Risk
The link between indoor tanning and skin cancer is one of the most well-established findings in dermatology. Using a tanning bed before age 35 increases the risk of melanoma, the deadliest form of skin cancer, by 59% to 79%. The World Health Organization’s cancer research agency classifies UV-emitting tanning devices in its highest risk category, alongside tobacco and asbestos.
The risk isn’t limited to melanoma. Regular tanning bed use also raises your chances of developing squamous cell carcinoma and basal cell carcinoma, the two most common skin cancers. The cumulative UV dose matters: the more sessions over a lifetime, the higher the risk climbs.
Premature Skin Aging
Because tanning beds deliver such concentrated UVA, they’re particularly effective at accelerating skin aging. UVA penetrates into the dermis, the thick middle layer of skin where collagen and elastin fibers provide structure and elasticity. There, it activates a family of enzymes that chew through type I and type III collagen, the two main varieties responsible for keeping skin firm. Even a single UV exposure is enough to switch on these enzymes. Over time, the result is wrinkles, sagging, uneven texture, and a leathery appearance that can make tanned skin look decades older than it is.
Eye Damage
UV radiation poses serious risks to your eyes. Without proper goggles, a tanning bed session can cause photokeratitis, essentially a sunburn on the surface of the eye. Symptoms include intense pain, tearing, light sensitivity, and a gritty feeling that typically sets in a few hours after exposure. Chronic UV exposure to the eyes raises the risk of cataracts, growths on the eye’s surface, and even a rare cancer called uveal melanoma. The FDA requires all tanning beds to include protective goggles, and simply closing your eyes during a session does not provide adequate protection.
The Vitamin D Question
One common argument in favor of tanning beds is that they boost vitamin D levels, which your body produces in response to UVB exposure. There’s partial truth here, but with a major caveat. Research has shown that low-pressure fluorescent tanning beds emitting around 2% to 4% UVB can raise blood levels of vitamin D significantly over a 9- to 12-week period. In one study, participants using these beds saw their vitamin D levels rise by an average of 42 nmol/L.
High-pressure beds, however, which filter out most UVB, produced no meaningful increase in vitamin D at all. Since vitamin D production depends entirely on UVB wavelengths, a bed designed to minimize UVB won’t help. And for beds that do contain enough UVB, oral vitamin D supplements achieve the same result without any of the skin cancer or aging risk.
Regulations Around the World
Governments have responded to the health evidence with varying levels of restriction. Australia implemented a near-total ban on commercial tanning beds across all states and territories. The United Kingdom bans indoor tanning for anyone under 18, as do New Zealand, France, Germany, Italy, Austria, Belgium, and most other Western European countries.
In the United States, 45 of 50 states have some form of restriction on minors using tanning beds, with 23 states enforcing a strict ban for anyone under 18. Nine additional states set different age cutoffs. Five states have no restrictions at all. In Canada, 10 of 12 provinces and territories ban minors from using tanning beds.
The FDA requires every tanning bed sold in the U.S. to carry a warning label stating it should not be used by anyone under 18. Devices must also include an accurate timer, an emergency stop control, an exposure schedule, and protective goggles.
Session Timing and Frequency
FDA guidelines require a minimum of 24 hours between tanning bed sessions. This gap gives skin cells time to repair some of the DNA damage inflicted by each exposure. Most salons recommend tanning one to three times per week to maintain color, with initial sessions kept shorter and gradually increased based on skin type. First-time users in low-pressure beds typically start with sessions around 5 to 10 minutes rather than the full 15 to 20 minutes the bed allows.
Your skin type plays a significant role in how you respond to UV. People with very fair skin, light eyes, and a tendency to burn rather than tan face the highest risk of acute burns and long-term damage. No amount of gradual exposure changes your skin’s fundamental vulnerability to UV-induced DNA damage, even if you stop burning.