2 cm²
Focused target area
Designed for smaller localized areas where precise positioning matters more than broad coverage.
308nm LED UVB Home Phototherapy Device, 2cm², UV308A
UV308A1-20mw/cm2
308nm LED UVB Home Phototherapy Device, 2cm², UV308A
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UV308A · Compact 308nm LED UVB for Kids
308nm LED UVB Device for Kids
Compact, lightweight, and built for small-area, parent-assisted home routines with clear Time / Dose control.
2 cm² Irradiation Area
≤70 g Handheld Body
OLED · Time / Dose
USB Rechargeable
2 cm²
Focused light window
Why UV308A
Small in hand. Focused where it matters.
At about 70 g and only 36 mm wide, UV308A is easy to position over a focused 2 cm² target area.
≤70 g
Lightweight handheld body
Easy for an adult to hold steadily and reposition during a supervised home routine.
2 modes
Time & Dose control
Choose the control method that matches the selected treatment plan.
3000h+
Long-life LED source
308nm LED technology with no routine lamp replacement.
Parent-assisted routine
Parent-Assisted Routine
Built around supervised home use.
Compact size, light weight and simple controls help parents manage a child’s supervised home routine.
Kid-friendly size
Travel-ready
USB rechargeable
Parent-controlled operation
An adult selects the setting, positions the device and manages the session.
Lightweight, steady positioning
About 70 g for steadier positioning over small treatment areas.
Clear, simple controls
The OLED display keeps time and dose easy to check.
Short, localized sessions may be easier to manage when a child has trouble staying still.
Choose Your Output
Three UV308A intensity options.
All three share the same 2 cm² window, compact body, OLED display and Time / Dose modes. Output is the main difference.
UV308A1
20
mW/cm²
6 LED chips
Lower-output option
UV308A2
35
mW/cm²
6 LED chips
Mid-output option
UV308A3
50
mW/cm²
8 LED chips
Higher-output option
For children, match the dose to the exact model—the same seconds deliver different doses on A1, A2 and A3.
Dose & Time
Start with dose. Then convert to seconds.
For 308nm devices, the same number of seconds can deliver very different doses. Start from the selected dose, then convert it using the exact model’s irradiance.
Formula
Time (s) = Dose (mJ/cm²) ÷ Irradiance (mW/cm²)
1 mW/cm² × 1 second = 1 mJ/cm²
Literature-based starting reference
What does published guidance use?
A German vitiligo guideline describes targeted 308nm starting doses of roughly 100–600 mJ/cm² depending on body site and MED. A published excimer review uses 150 mJ/cm² for face/neck, 200 for trunk/extremities and 300 for hands/feet, with a 50 mJ/cm² reduction suggested for pediatric use. [6][7]
These are literature references, not a validated universal UV308A prescription. Follow the UV308A IFU and clinician-selected dose.
| Reference site | Reference dose* | A1 · 20 mW/cm² | A2 · 35 mW/cm² | A3 · 50 mW/cm² |
|---|---|---|---|---|
| Face / neck | 100 mJ/cm² | 5.0 s | 2.9 s | 2.0 s |
| Trunk / arms / legs | 150 mJ/cm² | 7.5 s | 4.3 s | 3.0 s |
| Hands / feet | 250 mJ/cm² | 12.5 s | 7.1 s | 5.0 s |
*Pediatric-adjusted reference derived from a published excimer protocol. [7]
Choose the dose
Use the selected protocol, body site and exact model.
Convert to time
Divide dose by the model’s irradiance.
Position steadily
An adult holds the device steadily and protects the eyes.
Check the response
Check the skin before the next session; do not increase exposure while redness persists. [6][7]
Dose depends on the protocol, exact model and skin response. [1]
Compare UVB Devices
Compare coverage, output and controls.
UV308A is the smallest targeted option. Compare it with broader-coverage 311nm and 308nm models below.
You’re viewing: UV308A · 308nm LED UVB · 2 cm² targeted area
← Swipe horizontally to compare →
| Product |
311nm NB-UVB
BU-1S
$179
|
311nm NB-UVB
BU-1
$199
|
311nm NB-UVB
BU-10
$279
|
308nm LED UVB
UV308B
$369
|
308nm LED UVB
UV308E
$469
|
308nm LED UVB
UV308H4
$399
|
308nm LED UVB
UV308V
$569
|
|---|---|---|---|---|---|---|---|
| Wavelength |
311nm
NB-UVB
|
311nm
NB-UVB
|
311nm
NB-UVB
|
308nm
LED UVB
|
308nm
LED UVB
|
308nm
LED UVB
|
308nm
LED UVB
|
| Light Source |
Philips PL-S
9W/01/2P
|
Philips PL-S
9W/01/2P
|
Philips PL-S
9W/01/2P
|
LED | LED | LED | LED |
| Light Area | 48 cm² |
48 cm² |
48 cm² |
4 cm² |
10 cm² |
16 cm² |
22 cm² |
| LED / Output | — | — | — | 8 LEDs | 20 / 30 LEDs | 33 LEDs | 40 LEDs |
| UV Intensity | — | — | — |
25–35
mW/cm²
|
40–60
mW/cm²
|
35
mW/cm²
|
40–50
mW/cm²
|
| Control |
One-button
Instant start
|
Button + Timer
Digital timer
|
OLED + Buttons
Time & Dose
|
Time & Dose
Display
|
Time & Dose
Display
|
OLED + Voice
Time & Dose
|
OLED
Time & Dose
|
| Weight | 0.48 kg | 1.28 kg | 1.25 kg | 0.12 kg | 0.30 kg | 0.56 kg | 0.44 kg |
| Easy Choice |
Simplest 311nm option |
311nm + built-in timer |
311nm + OLED control |
Compact + more coverage |
Higher output + medium area |
Wide area + light comb |
Largest 308nm coverage |
| Learn More | View BU-1S | View BU-1 | View BU-10 | View 308B | View 308E | View 308H4 | View 308V |
Important Safety
Adult supervision is essential.
For children, an adult should manage the device and use the setting selected for the exact model.
Protect the eyes
Wear UV protective eyewear. Do not look into the light.
Use the correct setting
Do not copy another user’s dose or another model’s time.
Watch the skin response
Stop use if redness, pain or blistering persists.
Avoid extra UV exposure
Protect the treated area from unnecessary additional UV exposure.
Follow the UV308A IFU and professional guidance for treatment settings and safety.
FAQs
Practical answers before you start.
What is UV308A best suited for?
UV308A is a small-area 308nm LED device with a 2 cm² light window. It is intended for localized phototherapy rather than broad body coverage. Your product documentation lists vitiligo and psoriasis use under professional guidance.
Which UV308A model should I choose: A1, A2 or A3?
All three models use the same 2 cm² light window. The main difference is irradiance: A1 = 20, A2 = 35 and A3 = 50 mW/cm². Higher irradiance delivers the same dose in less time; it does not automatically mean a better result. Choose the model around the dose plan and tolerance, not simply the fastest exposure.
How many seconds should the first session be?
There is no universal first-time number of seconds. Targeted 308nm protocols usually start from a dose selected by body site, MED or professional guidance, then convert dose to time: time (s) = dose (mJ/cm²) ÷ irradiance (mW/cm²). For example, 100 mJ/cm² equals 5.0 s on A1, 2.9 s on A2 and 2.0 s on A3. [6][7]
How often is 308nm targeted phototherapy usually used?
Published 308nm protocols commonly use 2–3 non-consecutive sessions per week, with dose changes based on the previous skin response. Daily treatment should not be assumed unless it is specifically prescribed. [6]
What skin reaction is normal, and when should I stop?
Mild temporary pinkness can occur after UVB exposure. Pain, swelling, blistering, burning, or redness that persists beyond about 48 hours are signs to pause treatment and seek professional guidance before continuing. [6][7]
How soon might I see a response, and does body area matter?
308nm phototherapy is usually judged over multiple sessions, not after one or two uses. Published 308nm LED studies evaluated response after 8, 16 or more sessions. Facial lesions generally respond better, while hands and feet tend to respond more slowly. [2][3][6]
Can children use UV308A?
Home-based 308nm LED has been studied in pediatric vitiligo, but children need closer supervision and careful dose selection. A 2025 study of 75 pediatric patients found home-based 308nm LED can be a viable option when cumulative dose is appropriately managed, while also highlighting the need for education and professional guidance. British guidance generally does not offer phototherapy to children under 5. [1][8]
Is 308nm LED the same as a 308nm excimer lamp or laser?
They use the same target wavelength but different light-source technologies and delivery systems. Randomized studies in stable vitiligo have reported similar outcomes between 308nm LED and 308nm excimer lamp in selected protocols, but the devices and dosing schedules are not interchangeable. [2][4]
Can I use the same timing as a 311nm UVB lamp?
No. UV308A has much higher irradiance than typical 311nm handheld lamp systems, so its exposure time is usually much shorter. Do not copy a 311nm lamp schedule to UV308A; use dose-based conversion for the exact model.
Can I use a vitiligo dose for psoriasis, or vice versa?
No. Vitiligo and psoriasis protocols use different starting-dose logic and dose-adjustment rules. Published research supports targeted 308nm treatment in both conditions, but the treatment plan should match the diagnosis and body site. [5][6][10]
View selected clinical references
- He J, Xiang J, Feng D, et al. Home-based 308nm LED vs hospital-based excimer light in pediatric vitiligo. Photodermatol Photoimmunol Photomed. 2025.
- Hu Y, Liu L, Xu Z, et al. 308nm LED vs 308nm excimer lamp for vitiligo: randomized controlled trial. 2024.
- Luan C, Hu Y, Ju M, et al. Treatment of vitiligo with 308nm LED. 2022.
- Hu Y, Xu Z, Liu L, et al. 308nm LED vs excimer lamp in facial vitiligo. Arch Dermatol Res. 2025.
- Yu et al. 308nm LED vs excimer laser for localized psoriasis. Front Med. 2023.
- Böhm M, et al. S1 Guideline: Diagnosis and therapy of vitiligo. 2022.
- Bae JM, Hann SK. Laser Treatments for Vitiligo. 2016.
- Eleftheriadou V, et al. British Association of Dermatologists vitiligo guideline. 2022.
- Seneschal J, et al. Worldwide expert recommendations for vitiligo management. 2023.
- Elmets CA, et al. AAD–NPF psoriasis phototherapy guideline. 2019.
Published studies cited above evaluated other 308nm devices and clinical protocols. They do not constitute a clinical trial of UV308A and do not guarantee individual outcomes.