Tanning Bed Product

Overview

A tanning bed is a clamshell enclosure that delivers a controlled dose of ultraviolet radiation to the whole body at once. The occupant lies on the Bench Acrylic while two opposed lamp banks — the Canopy Lamp Bank above and the Bench Lamp Bank below — irradiate both sides of the body simultaneously. A commercial bed carries 40 to 60 fluorescent tubes totalling 6–10 kW, which makes it one of the most power-dense appliances in a salon and the reason most units require a three-phase or dedicated high-current supply.

Each UV Fluorescent Lamp is a low-pressure mercury discharge tube, mechanically identical to an ordinary fluorescent lamp but coated with a phosphor blend that converts the mercury 254 nm line into UVA (315–400 nm) with a small UVB fraction of typically 1–3 %. UVA drives immediate pigment darkening of existing melanin; the UVB fraction stimulates new melanin production and is the component most tightly limited by regulation. European beds sold since 2009 are capped at 0.3 W/m² erythemally weighted irradiance under EN 60335-2-27, roughly equivalent to tropical midday sun.

How it works

Fluorescent tubes are negative-resistance devices, so every pair of tubes is fed from a Electronic Lamp Ballast in the Ballast Bank. Modern beds use electronic ballasts running at 25–45 kHz: the ballast preheats the tube cathodes, applies a strike voltage of roughly 600 V, then folds back to regulate arc current. High-frequency operation eliminates flicker and improves lamp efficacy by about 10 % over 50 Hz magnetic gear. A Mains EMC Filter keeps the combined switching noise of two dozen ballasts within EN 55015 limits, and Relay contactors let the controller switch the banks as groups.

Behind the tubes, the Reflector Tray of anodised aluminium recovers radiation emitted away from the occupant; together with reflector-coated tubes it raises effective irradiance at the skin by 20–40 %. The Acrylic Window Set that close off the lamp compartments are not ordinary plastic: UV-grade PMMA passes more than 90 % of UVA, whereas window glass or polycarbonate would block most of it. Transmission degrades as the material photo-yellows, so the panels are tracked on the Hour Meter and replaced after roughly 1,500–2,000 hours along with scheduled lamp changes — tubes themselves fall to about 70 % of rated output after 600–1,000 hours and are replaced well before failure.

Thermal management

Nearly all of the 6–10 kW input ends up as heat, and low-pressure lamp output is strongly temperature-dependent, peaking at a tube wall temperature near 40 °C. The Cooling System system therefore serves the lamps first and the occupant second. Six Axial Fan units pull a continuous draft through the canopy and bench compartments, monitored by Compartment Thermostat sensors that raise fan speed with cavity temperature and cut lamp power entirely on overheat. A separate Blower Motor feeds the Air Duct to the head-end vents, giving the occupant an adjustable stream of cooling air. Thermal Fuse cutouts in the ballast compartment back up the electronic protection.

Facial tanner

Because facial skin tans less readily than the trunk, most beds add a Facial Tanner Unit of three high-pressure metal-halide burners aimed at the face. Each High-Pressure Facial Lamp runs at 400–500 W from a Facial Lamp Ballast whose ignitor strikes the arc with a 4–5 kV pulse. The raw arc emits hard UVB and UVC, so a UV Filter Glass plate of cobalt-doped borosilicate sits in the beam and passes only UVA; interlocks must prevent operation with the glass cracked or removed, since an unfiltered burner can cause photokeratitis in seconds. A Facial Reflector with a dichroic coating concentrates the UV while letting infrared escape rearward, and dedicated fans keep the filter glass below its thermal-shock limit.

Control and safety

The Timer and Control Unit unit enforces the exposure dose. Its Microcontroller runs a hard session timer — 5 to 20 minutes depending on lamp configuration and skin-type schedule — displayed on the LCD Panel and started either from the internal Control Keypad or, in salons, from a remote front-desk timer wired through the external Connector port so staff control every session. Regulatory design points include the timer's independence from software faults (a hardware backup timer or contactor dropout), the counterbalanced Gas Spring Strut struts that prevent the canopy falling on an occupant, and mandatory eyewear because the eyelid transmits enough UVA to damage the cornea and lens. In the United States, beds are regulated as FDA Class II devices under 21 CFR 1040.20, which dictates timer accuracy, labelling and the maximum-exposure schedule on the canopy decal.

Service items

Routine maintenance is dominated by consumables: tubes in matched sets so irradiance stays uniform, acrylics on hour count, the Acrylic Edge Gasket seals that keep disinfectant out of the lamp cavity, and the washable mesh in each Fan Grille. The Acrylic Latch retainers make the panels removable without tools, since salons disinfect the bench surface between every session.