Narrowband 311nm UVB phototherapy delivers a specific wavelength of ultraviolet B light that reduces inflammation and modulates immune activity in the skin. It is used to stimulate repigmentation in vitiligo and reduce plaques and itching in psoriasis and other inflammatory dermatoses.
The device is intended for treatment of vitiligo and skin discoloration, management of psoriasis outbreaks, relief of eczema/atopic dermatitis, support in mycosis fungoides therapy, and assistance in healing conditions such as pityriasis rosea. Use should be guided by a treating clinician.
The unit is designed to be lightweight and portable for both professional and home use. However, initial treatment protocols, dosing and safety instructions should be provided by a dermatologist or trained clinician before home use.
Treatment frequency and duration depend on the condition, skin type, and prescribed dose. Clinically, narrowband UVB is commonly administered multiple times per week, but you must follow a dermatologist's individualized protocol. The device includes an LCD timer to track each session.
Always protect the eyes with appropriate UV-blocking goggles, avoid direct exposure to unaffected skin unless directed, cover or shield sensitive areas, do not treat open wounds, and avoid use with photosensitizing medications unless cleared by your physician. Follow all clinician instructions.
Common short-term effects include redness, itching, and mild burns if doses are too high. Long-term risks may include photoaging and an increased risk of skin cancer after extensive UV exposure. Discuss risk–benefit with your dermatologist.
Patients with known photosensitivity disorders, active skin cancer, a history of severe reactions to UV therapy, or those taking photosensitizing drugs should not use the device without specialist approval. Pregnant or breastfeeding patients should consult their healthcare provider before use.
Children can sometimes be treated with narrowband UVB but only under the supervision and prescription of a pediatric dermatologist. Dosing and protocols differ from adults.
Model SH1B (brand SIGMA) features a 311nm narrowband UVB wavelength, an irradiation area of 11 x 2 cm, 1 UV bulb, an LCD timer, Class II instrument classification, online technical support, single package size 51 x 35 x 15 cm and gross weight about 2.2 kg.
Unplug the device before cleaning. Wipe external surfaces and the lamp cover with a soft, dry or slightly damp cloth; avoid liquid ingress into electronic components. Do not attempt internal repairs—contact technical support for servicing.
This unit uses a single replaceable UV bulb. For bulb replacements, compatible parts and instructions should be obtained through the manufacturer or authorized supplier. Contact the online technical support specified by the seller for guidance and approved parts.
The product listing indicates online technical support is available. Warranty terms are not specified in this listing—check with the seller or manufacturer for warranty length, coverage details, and how to access support.
Response time varies by condition, lesion size, location, skin type and treatment frequency. Some patients may notice improvement after several weeks to a few months. Your dermatologist will set expectations based on your specific case.
The irradiation area is 11 x 2 cm, so treating larger surfaces will require sequential applications to adjacent areas. Your clinician can advise on technique, overlap and total treatment time to ensure uniform coverage.
Narrowband 311nm UVB is often preferred for many inflammatory and pigmentary conditions because it is effective with a favorable safety profile compared with PUVA (psoralen plus UVA), which requires a photosensitizing medication and has different side-effect considerations. Discuss options with your dermatologist to determine the most appropriate therapy.
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