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308nm LED UVB Home Phototherapy Device, 4cm², UV308B
UV308B1-25mw/cm2
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Vendor:Youwemed
308nm LED UVB Home Phototherapy Device, 4cm², UV308B
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TRAVEL-READY DESIGN
Portable care, wherever you go.
At just 120 g, UV308B fits easily into a work bag or suitcase, with a rechargeable body and a 4 cm² localized window.
120 g
lightweight handheld design
Business trips
Compact for carry-on packing
Holidays
Simple to store with accessories
120 g
150 × 35 × 32 mm
Rechargeable
4 cm² window
Pack the device, protective eyewear, instructions and charging cable together.
Continue only the routine selected for you by a qualified professional.
DESIGNED FOR EVERYDAY USE
Built for simple daily use.
Long-life LEDs, Type-C charging and physical buttons bring the essentials together in one compact handheld device.
8 LEDs · 4 cm² window
LONG-LIFE LED SOURCE
3,000+
hours of rated LED service life
A long-life LED source helps reduce routine lamp replacement during long-term home ownership.
Long service life
8-LED output window
LED ARRAY
Eight LED chips
Arranged across the defined output window.
RECHARGEABLE
Type-C charging port
Recharge without disposable batteries.
LOCALIZED OUTPUT
4 cm² treatment window
A compact area for localized positioning.
TACTILE CONTROL
Easy-to-feel buttons
Adjust the selected mode with tactile controls.
308NM LED OUTPUT
One wavelength. Two outputs.
Choose 25 or 35 mW/cm². The 35 mW/cm² version delivers the same selected dose in less time, so always use timing for your exact model.
The illustration is a simplified view of the optical path through the outer skin layers—not a prediction of individual results.
308nm LED · simplified skin-layer illustration
UNDERSTANDING 4 CM²
See what 4 cm² means.
The window covers about a 2 × 2 cm square (roughly 0.8 × 0.8 in)—still compact for localized areas, with twice the area of UV308A.
2 cm2 cm
4 cm²
2 cm × 2 cm · about 0.8 × 0.8 in
Diagram only—not actual screen size.
01
Around the lips
A small window can make positioning around compact facial areas easier to understand.
02
Around the ear
The 4 cm² area remains manageable near small, curved locations.
03
Toes and feet
Useful for visualizing coverage across smaller localized areas.
04
Fingers and hands
More area per placement than a pinpoint 2 cm² window.
Examples explain window size only. They are not treatment instructions; follow the UV308B IFU and professional guidance for placement, distance and timing.
OUTPUT & DOSE
Convert dose to time.
The same time delivers a different dose on the 25 and 35 mW/cm² versions. Always use the output printed on your exact device.
CONVERSION FORMULA
Time (s) = Dose (mJ/cm²) ÷ Irradiance (mW/cm²)
1 mW/cm² × 1 second = 1 mJ/cm²
Selected example
100 mJ/cm² ÷ 25 mW/cm² = 4.0 s
CURRENT SELECTION
25 mW/cm²
The matching example and table column are highlighted. Confirm this output is printed on your device.
Illustrative conversion examples
Not treatment recommendations| Example dose | 25 mW/cm² selected | 35 mW/cm² selected |
|---|---|---|
| 100 mJ/cm² | 4.0 s | 2.9 s |
| 150 mJ/cm² | 6.0 s | 4.3 s |
| 250 mJ/cm² | 10.0 s | 7.1 s |
Use only a clinician-selected or IFU-specified dose. Confirm the output printed on your exact device before calculating time.
-
1
Confirm output
25 or 35 mW/cm².
-
2
Use the selected dose
Follow the prescribed protocol.
-
3
Convert carefully
Dose ÷ exact irradiance.
A SIMPLE PRE-SESSION CHECK
Four checks before you begin.
Keep the UV308B instructions nearby and confirm these four points before each session.
Keep your kit together
Device · eyewear · IFU · charging cable
Put on protective eyewear
Follow the supplied instructions for the user and anyone nearby.
Confirm the intended area
Protect surrounding skin and expose only the selected localized area.
Check output and time
Use the settings for your exact model—never copy timing from another device.
Check the skin response
Pause and ask a qualified professional if discomfort or persistent redness occurs.
Ready to begin? Confirm the model, selected time, positioning and protective eyewear one final time.
FAQ & EVIDENCE
UV308B FAQs.
Clear answers about UV308B use, settings and safety.
What size of area is UV308B designed for?
Its treatment window is 4 cm²—about a 2 × 2 cm square. It is intended for small, clearly defined areas where you want more coverage per placement than the 2 cm² UV308A, while still keeping the device compact. For large or many separate areas, a wider-window device may be more efficient.
What changes between the 25 and 35 mW/cm² versions?
Both versions use the same 308nm wavelength, 4 cm² window and eight-LED design; the irradiance is different. For an example dose of 100 mJ/cm², the calculated time is 4.0 seconds at 25 mW/cm² and 2.9 seconds at 35 mW/cm². Always calculate with the output printed on your device.
Can I use a universal “30-second” starting time?
No. At the nominal outputs, 30 seconds calculates to 750 mJ/cm² on the 25 mW/cm² version and 1,050 mJ/cm² on the 35 mW/cm² version. This is why a time copied from another model or online schedule can be inappropriate. Use only the dose and schedule in your exact IFU or selected by a qualified professional.
How close should I hold the device?
The current UV308B product guidance specifies a distance of 1–3 cm from the skin. Keep the device steady and the angle and distance consistent. If the instructions supplied with your exact unit specify a different position, follow those instructions.
What skin response means I should stop or delay the next session?
A mild, temporary pink response may occur. If redness is still present before the next session, postpone treatment until it settles. Stop treatment if you develop painful redness, strong burning, swelling or blisters; do not re-expose the area until it has recovered, and seek medical advice for a significant or persistent reaction.
How should I protect my eyes and surrounding skin?
Wear UV-protective goggles and never look directly at the operating light. Expose only the intended area and cover surrounding untreated skin with opaque material when practical, following the UV308B instructions.
Can I take UV308B on business trips or holidays?
Yes, its 120 g rechargeable handheld body is designed to be easy to pack. Keep the device, protective eyewear, IFU and charging cable together in a protective case. Before flying, check the airline’s current rules for carrying rechargeable devices and batteries.