UVB lamp guide
The Clearlight SUN ONE is a compact, rechargeable lamp that emits ultraviolet B (UVB) light; it is not an infrared or red light device. This guide covers how UVB relates to vitamin D, what limits that process, what trials of other artificial UVB sources found, what has not been studied, the risks, and Clearlight's safety instructions. We found no published study of the SUN ONE itself.
Sauna Republic is an authorized Clearlight dealer and sells the SUN ONE; Clearlight's claims are quoted as Clearlight's. UV is a carcinogen, and the American Academy of Dermatology recommends diet and supplements, not UV, for vitamin D. For infrared or red light, see our infrared therapy and red light therapy guides.
What the Clearlight SUN ONE is
Clearlight specifies a "precise 295 nm peak wavelength" and "at least 99% UVB with no more than 1% UVA." Our listing describes quartz-glass LEDs, which Clearlight estimates will last over 1,000 hours. Full details are on our Clearlight SUN ONE Wellness Lamp page.
Per our listing, a distance sensor pauses the light outside 9.8 to 15.7 inches (25 to 40 cm) and ends the session after ten seconds out of range. The timer is capped by Fitzpatrick skin type at 1 to 5 minutes, adjustable down but not up, and everyone starts at 30 to 60 seconds. Clearlight and our listing both allow one session a day at most.
Clearlight's shop page lists a 12.8V, 2000 mAh lithium battery with up to 60 minutes per charge and about 3.5 hours to recharge. The lamp measures about 14.1 by 8.3 by 2.1 inches and includes protective eyewear. Clearlight says it can be used alone or during a Clearlight sauna session but never charged in the sauna. Confirm warranty terms with us before ordering.
UVA, UVB and UVC: where the SUN ONE sits
The World Health Organization divides ultraviolet radiation into UVA (315–400 nm), UVB (280–315 nm) and UVC (100–280 nm). WHO notes that "Most solar UVB is filtered by the atmosphere." Clearlight's stated 295 nm peak sits inside WHO's UVB band.
NIH describes commercial tanning beds as emitting "2% to 6% UVB radiation," which leaves most of their UV as UVA, while Clearlight specifies the SUN ONE as at least 99 percent UVB, so tanning-bed findings on vitamin D or cancer do not transfer to it either way. Nor is a UVB-dominant lamp harmless: the International Agency for Research on Cancer concluded that UVA, UVB and UVC are all carcinogenic to humans, and FDA states that "both UVA and UVB, can cause skin cancer."
LED technology does not alter this: LED describes how light is made, not its effect on skin, and unlike the visible LEDs in sauna chromotherapy, a UVB LED emits ultraviolet.
How UVB relates to vitamin D
According to the NIH Office of Dietary Supplements, UVB of "approximately 290 to 320 nanometers" reaching uncovered skin converts 7-dehydrocholesterol into previtamin D3, which becomes vitamin D3 and is then activated in two steps. NIH calls blood 25-hydroxyvitamin D, or 25(OH)D, "the main indicator of vitamin D status," and notes that "UVB radiation does not penetrate glass."
What limits skin production
NIH lists season, time of day, cloud cover, smog, skin melanin and sunscreen among the factors. Research puts numbers on four limits.
What studies of artificial UVB found
Controlled studies have exposed people to artificial UVB and measured blood 25(OH)D. None tested the SUN ONE or a 295 nm hand-held LED; sources, doses and exposed areas differ, and several ran under clinical supervision.
Trials in people
A 2018 systematic review and meta-analysis of 15 studies of artificial UV exposure (829 participants) reported that the rise in 25(OH)D depended on UV dose and starting level; the authors cautioned that skin type, age and body mass index could not be considered.
In a small 1998 randomized trial, 45 women in a psychogeriatric nursing home, average age 85 and 95% with 25(OH)D below 30 nmol/L, were assigned to UVB to the lower back three times a week at half the "minimal erythemal dose" (the smallest dose that reddens skin), to 400 IU of oral vitamin D3 daily, or to no treatment. After 12 weeks, median 25(OH)D was around 60 nmol/L in both treated groups; the untreated group did not change.
In a 2012 randomized trial in people with 25(OH)D at or below 25 nmol/L, full-body narrowband UVB three times a week raised mean levels from 19.2 to 75 nmol/L in six weeks, against 23.3 to 60.6 nmol/L with 1,600 IU of oral vitamin D3 plus calcium daily. Only 32 of 73 enrolled finished.
In a randomized trial of 34 participants, suberythemal whole-body narrowband UVB every second week from October to April raised mean 25(OH)D by 11.7 nmol/L while controls fell by 11.1. Both groups started near 77 to 78 nmol/L, above the 50 nmol/L NIH calls "generally considered adequate," so this tested maintenance, not deficiency.
The abstracts of the three trials above do not report on side effects, such as skin redness, either way.
A 2025 trial in Anticancer Research randomized 69 adults with 25(OH)D below 30 ng/mL to a commercial UVB light system or a sham light; after titration, the UVB group had weekly full-body exposure, face excluded, at 0.6 of each person's minimal erythemal dose for 16 weeks. Average 25(OH)D rose 10.2 ng/mL from week 1 to week 21, against a 2.3 ng/mL fall with sham light (this trial reports ng/mL, not nmol/L; NIH's table pairs 20 ng/mL with 50 nmol/L). Adverse events, most often redness and itchiness, were reported by 66% of the UVB group and 38% of the sham group; no serious adverse events were reported. The manufacturer funded and supervised the study, 27 UVB and 20 sham participants completed it, and the authors list "the relatively small sample size and short follow-up period" among its limitations.
Laboratory studies of UVB LEDs
The UVB LED evidence we found comes from laboratory work on donated skin: in a 2020 study, a commercially available 295 nm LED converted more 7-dehydrocholesterol to vitamin D3 as time and dose rose, and in a 2017 study, a 293 nm LED made vitamin D3 in skin samples more efficiently than October sunlight in Boston. Neither measured blood levels.
What has not been studied
We found no published study of the SUN ONE, and Clearlight's research page lists only infrared sauna studies; nor did we find any 295 nm LED device study measuring blood vitamin D in people. Clearlight says: "Because everyone responds differently, we cannot predict exact levels." No erythema-dose figure is published for the SUN ONE, so the trial schedules cannot be translated into its sessions.
Weighing the SUN ONE?
Read the risks and Clearlight's instructions below first. Then tell us how you plan to use it, and a specialist will reply with current pricing.
Get PricingThe risks of UV exposure, stated plainly
The public health and medical statements below concern ultraviolet radiation in general; none of them names the SUN ONE.
Skin cancer
NIH states that "UV radiation is a carcinogen, and UV exposure is the most preventable cause of skin cancer." In 2009 the International Agency for Research on Cancer classified UV-emitting tanning devices as "carcinogenic to humans (Group 1)." WHO states that "UVR is carcinogenic to humans" and lists sunburn and phototoxic and photoallergic reactions among its acute effects.
The AAD's position on UV and vitamin D
The American Academy of Dermatology "does not recommend getting vitamin D from sun exposure or indoor tanning" and recommends food sources for healthy adults. Its position statement, last amended in 2010, adds supplements and states: "Vitamin D should not be obtained from unprotected exposure to ultraviolet (UV) radiation." The AAD also says there is "not a safe level of UV exposure from the sun or indoor tanning devices that allows for maximum vitamin D synthesis without increasing skin cancer risk."
Eye injury
WHO lists photokeratitis and photoconjunctivitis among UV's acute effects, and FDA says photokeratitis "can be thought of as a sunburn of the cornea." FDA's required warning on tanning sunlamps says that failing to wear protective eyewear "may result in severe burns or long-term injury to the eyes," and Clearlight says UVB "can cause serious eye damage over time" without protection.
Medications
FDA warns that some medicines "contain ingredients that may cause photosensitivity" with "either natural sunlight or artificial light, such as a tanning booth." Its list includes certain antibiotics, antifungals, antihistamines, diuretics, NSAIDs, oral contraceptives, psoralens and retinoids, among others, plus alpha-hydroxy acids in cosmetics. Clearlight's list, which it calls not exhaustive, adds acne treatments and antidepressants, and says psoralens "should only be combined with UVB exposure under the direct supervision of a physician." Ask your pharmacist or doctor first.
Skin type, dose and burns
The Fitzpatrick scale's six phototypes describe skin by "basal complexion, melanin level, inflammatory response to UV and cancer risk," and, per our listing, the SUN ONE's timer cap follows the type you select. Burning depends on dose (intensity and time), distance, skin type and medications, not session length alone. Clearlight warns that more than one session a day "increases the risk of burning and skin damage," and in the 2025 trial, where doses were set below each person's redness threshold, adverse events were reported by 66% of the UVB group, against 38% with sham light.
Who Clearlight says should not use it
Several of the exclusions below mirror labeling FDA requires on tanning sunlamps, though no source we found says that rule covers the SUN ONE.
If you are pregnant or breastfeeding, Clearlight says to consult your physician first.
Regulation: what FDA defines, and what is unsettled
FDA's performance standard defines a "sunlamp product" by its intended use, "to induce skin tanning," and in 2014 FDA reclassified UV lamps intended to tan the skin from class I to class II, with a warning against use under 18.
Clearlight says the SUN ONE "is not a tanning device" and calls its products "General Wellness products" whose statements "have not been evaluated by the Food and Drug Administration." FDA's general wellness guidance lists "sunlamp products promoted for tanning purposes" among products it would not consider low risk. We found no authoritative statement of the SUN ONE's FDA category and draw no conclusion about it.
Vitamin D without UV: food, supplements and testing
The NIH consumer fact sheet calls fatty fish such as trout, salmon, tuna and mackerel, and fish liver oils, "among the best natural sources of vitamin D." Beef liver, egg yolks and cheese "have small amounts," and mushrooms "provide a little." Almost all U.S. milk is fortified, with "about 3 mcg (120 IU) vitamin D per cup," as are many breakfast cereals and some orange juice, yogurt and margarine.
The Recommended Dietary Allowances that NIH lists are 15 mcg (600 IU) a day for ages 1 to 70 and 20 mcg (800 IU) over 70; NIH notes they were set "on the assumption that people receive minimal sun exposure." These are intake amounts for food and supplements, not targets for UV exposure.
NIH notes that blood 25(OH)D reflects vitamin D from skin, foods and supplements; the AAD's position statement says a 25(OH)D blood test "is widely available." Whether to test or supplement is for your clinician to advise; as the AAD puts it, "talk to your doctor."
Using the SUN ONE as Clearlight instructs
If you and your clinician decide the SUN ONE suits you, these are Clearlight's and our listing's instructions. Read the full manual first; it governs wherever it differs.
Who it may suit, and who it does not
Clearlight describes the SUN ONE as delivering "controlled, targeted UVB light to support the body's natural Vitamin D production process," but we found no study of the SUN ONE that tests that claim.
On Clearlight's terms, it is for adults not on its do-not-use list who will wear the eyewear, keep to the timer and want a brief UVB session, not a tan; talk with a clinician first. It does not suit anyone seeking a tan, a substitute for testing, diet or supplements, or infrared heat or red light.
In a home setup it is a separate, UV-specific tool. For the heat and red light side, see our guides to the Clearlight red light tower, red light with an infrared sauna and therapy stacking, and our Sanctuary vs Premier comparison of Clearlight's cabins.
Frequently asked questions
Is the SUN ONE a tanning lamp?
Clearlight says it "is not a tanning device," which describes its intended purpose, not how your skin will respond. FDA's view: "There is no such thing as a safe tan."
Can I use the SUN ONE inside my sauna?
Clearlight's FAQ says yes, during a Clearlight sauna session, but never charge it there; it warns that "Prolonged exposure to heat can degrade the battery over time." Our listing gives a maximum operating temperature of 140°F (60°C), so ask us to confirm with Clearlight that your sauna's setting suits the lamp first.
Can I use it instead of vitamin D supplements?
Not on the evidence here. The AAD recommends food and supplements, not UV, for vitamin D; Clearlight says it "cannot predict exact levels"; and we found no study of the SUN ONE. Ask your clinician about testing your 25(OH)D level.
Is the SUN ONE safe for everyone?
No. Clearlight excludes the groups listed in the risks section, including anyone under 18 or with a history of skin cancer, and UV carries the risks described there for every user.
Do I need eye protection with the SUN ONE?
Yes. Clearlight says to use the eyewear supplied with the lamp at every session, and our listing says everyone in the room needs eye protection and that glasses, contact lenses and sunglasses are not a substitute.
Has the SUN ONE been studied?
Not that we could find, and Clearlight's research page lists no study of it. The closest evidence is laboratory work on UVB LEDs in donated skin and trials of other UVB sources in people.
Get pricing on the Clearlight SUN ONE
Tell us how you plan to use it, and a specialist will reply with current pricing and answer your setup questions.
Request pricingSee the Clearlight SUN ONE product page for the full listing, or browse our UVB lamp collection and Clearlight wellness devices.
Clearlight, SUN ONE, Sanctuary and Premier are trademarks of Sauna Works, Inc., dba Clearlight Infrared. Sauna Republic is an authorized Clearlight dealer. This article is for educational purposes and is not medical advice. Clearlight describes its products as general wellness products; their statements have not been evaluated by the FDA, and they are not intended to diagnose, treat, cure or prevent any disease. The SUN ONE emits ultraviolet radiation. Read the full manual before use, and talk with a healthcare professional first if you take medication, have a history of skin cancer or a photosensitive condition, or are pregnant or breastfeeding.
