Description
Kernel Handheld 308nm Excimer LED UVB Lamp PRO, Light Intensity 40 mw/cm² –KN4003B4 – Higher Intensity, Higher Targeting, Precise Phototherapy for Localized Vitiligo on Face, Hands and Feet
Introducing the 308nm Excimer LED Lamp PRO, KN4003B4 – an innovative, advanced, and safe home phototherapy solution for various skin conditions unresponsive to topical therapy, including:
- Vitiligo
- Moderately severe localized psoriasis
- Eczema
-
Parapsoriasis
-
Atopic dermatitis
- Pityriasis rosea
Achieve clearer skin and visible re-pigmentation in as little as two months.
Powered by advanced LED technology, KN4003B4 emits pure 308nm narrowband light that closely mimics 308nm excimer laser output. With dual treatment modes, lightweight handheld design and enhanced targeting precision, KN4003B4 delivers effective, safe, and affordable 308 excimer light therapy—at home or on the go.
- Suppressing the cutaneous cell-mediated immune response
- Speed up skin re-pigmentation
- Reduce itching, swelling and inflammation
- Smooth and shrink raised red, scaly or patches
Why 308nm is better than 311nm?
- Faster Results – 308nm delivers stronger energy per second than 311nm. On average, 308nm Excimer takes 20 times of treatment to achieve obvious results.
- Higher Targeting – The 308nm wavelength directly targets immune cells responsible for skin inflammation, helping to stop flare-ups and speed up healing.
- Safer – The 308nm wavelength allows for precise targeting of affected areas while reducing unnecessary UV exposure to healthy skin. The treatment is non-invasive and painless, with only a slight warming sensation. It is safe for children, infants, and even pregnant women.
Product Highlights
- Convenient, Effective Alternative to Frequent Doctor Visits
- Utilizes 308nm Excimer LED, a clinically proven wavelength that delivers stronger energy per second compared to 311nm, resulting in faster and more noticeable improvements with fewer treatment sessions.
- Highly-targeted Therapy for Localized Areas
- With an 1.24 in² ± 10% treatment size, the KN4003B4 ensures precise treatment, focusing on affected skin while protecting surrounding healthy areas.
- Dual Treatment Modes for Customizable Therapy
- In addition to the time-based treatment mode offered by the KN4003B3, the KN4003B4 also provides dosage-based treatment options.
- Users can directly set the treatment dosage per session, ensuring consistent and precise therapy without manual calculations.
- Built-in MED Test for Personalized Treatment
- The Minimal Erythema Dose (MED) test feature helps determine the optimal dosage based on skin sensitivity, ensuring effective yet safe treatment.
Additional Features
✔ Stable & Long-Lasting Light Source – High-quality LED technology ensures a consistent, pure and durable light source with a 3,000-hour lifespan.
✔ Compact & Portable – Small, lightweight, and easy to carry, enabling continuous treatment anytime, anywhere, even while traveling.
✔ Rechargeable & Convenient – Powered by a built-in rechargeable battery with a USB Type-C charging port, allowing up to 25 minutes of uninterrupted use per full charge without losing intensity.
Treatment Guidelines for Phototherapy
NB-UVB Phototherapy Treatment Session and Frequency
| Skin Condition | Treatment Frequency | Noticeable Results are Seen after |
| Psoriasis | 3-4 sessions per week | 15-20 sessions |
| Vitiligo | 2-3 sessions per week | 30-50 sessions |
NB-UVB Phototherapy Dose Guidelines by Body Area
Initial Dose
- Psoriasis: 300 mJ/cm²,
- Vitiligo: 150-200 mJ/cm²
|
Body Area |
In addition to the initial dose, add dose |
|---|---|
| Face & Perineum | 150 ~ 180 mJ/cm² |
| Hand & Palm | 400 mJ/cm² |
| Torso & Limbs | 200 ~ 250 mJ/cm² |
Instruction for Use
Pre-Treatment Steps:
1. Bathing: Take a 15-20 minute bath to remove skin scales.
2. Determine MED: Minimum Erythema Dose (MED) must be calculated before treatment.
- Kernel KN4003B4 Lamp Intensity: 40 mw/cm²
- MED Formula: Irradiation Time (seconds)=Dose (mJ/cm²) ÷ Lamp Intensity (mW/cm²)
Dose Adjustment Guidelines:
A. No Erythema or Previous Erythema Resolved:
- Increase dose by 20-25%.
B. Mild Erythema:
- Maintain the same dose or increase by 10%.
- If resolved, follow "A."
C. Asymptomatic Shiny Erythema:
- Skip one treatment, then resume with the same dose.
- Gradually increase by 10% for subsequent sessions.
D. Painful Erythema with Edema or Blisters:
- Stop treatment until recovery.
- Resume at half the previous dose.
Important Consideration
- Always use protective eyewear during the treatment.
- Document the dosage and monitor your skin’s response after each session to adjust dosing appropriately.
- Consult with a dermatology professional before starting or modifying phototherapy treatments.
Business Transparency
Kernel, founded in 1997, is dedicated to research, development, and manufacturing in the high-tech medical equipment industry, with leading innovations in UV phototherapy devices, colposcopes, and PDT photodynamic therapy devices. Headquartered in Jiangsu, China, Kernel has offices in more than 30 countries and regions worldwide and is widely praised for its quality, effectiveness, and after-sales service. Kernel's products have been approved by the FDA, CE, and ISO 9001. Ahead of its peers in the medical equipment field, Kernel is also a supplier to the United Nations.
14-Day Return Policy
- Customers may return eligible products within 14 days of delivery for a refund or exchange.
- For hygiene and safety reasons, opened or used products cannot be returned unless defective or faulty.
- A 20% restocking fee applies to all returns except defective. We will repair, replace, or refund defective items free of charge.
- For full details, please refer to our Return Policy under the Warranty tab.
Comparison Chart
| Product Model | KN4003BL | KN4003B3 | KN4003B4 |
KN5000C | KN308E |
 |
 |
 |
 |
 |
|
|
Setting |
Home and travel |
Clinics, hospitals and home |
|||
|
Name |
Corded, Handheld 311nm UVB Lamp |
Cordless, Handheld 308nm Excimer LED UVB Lamp |
Cordless, Handheld 308nm Excimer LED UVB Lamp PRO |
Excimer Laser 308nm - Highest Intensity and Precision UVB Lamp |
Excimer LED 308nm - High-power UV Lamp |
|
Price |
$288.4 |
$664 |
$773 |
$2,999.48 |
$3,039 |
| Application | Psoriasis and vitiligo affecting slightly larger areas of the skin—such as the face, scalp, neck, hands, and feet. |
- Localized vitiligo - Moderately severe localized psoriasis - Moderately severe eczema, atopic dermatitis, pityriasis rosea and other autoimmune skin conditions unresponsive to topical treatments |
– Patients with a longer history of more severe Vitiligo conditions. – Patients who have not seen any improvement from other treatments. |
||
| Lamp Intensity | 4.5mw/cm² | 30 mw/cm² | 40 mw/cm² | 50 mw/cm² | 60 mw/cm2 |
| Treatment Size | 8.5 in² ± 10% | 1.24 in² ± 10% | 1.24 in² ± 10% | 3.1 in² ± 10% | 3.1 in² ± 10% |
| Light Source | 1 x 311nm UVB Light 311nm ± 3nm | 1 x UV LED | 1 x UV LED | XeCl Excimer Laser 308nm ± 2nm | High-power UV LED |
| Treatment Speed | Fast | 6.7X Faster | 8.8X Faster | 10X Fastest | 10X Fastest |
| Working Mode | Time | Time | Time and Dosage | Time and Dosage | Time and Dosage |
| MED Test | No | No | Yes | Yes | Yes |
| Work Distance | 1.18 in ± 0.20 in | 1.18 in ± 0.20 in | 1.18 in ± 0.20 in | 1.18 in ± 0.20 in | 1.18 in ± 0.20 in |
| Power source | Corded | Cordless, Built-in Rechargeable Battery, up to 35 minutes | Cordless, Built-in Rechargeable Battery, up to 25 minutes | Corded | Corded |
| Light Source Lifespan | ≤ 500h | ≤ 3,000h | ≤ 3,000h | ≤ 500h | ≤ 30,000h |
| Package | KN4003BL, cord, UV-proof glasses, instruction | KN4003B3, UV Googles, Charging Cable, Dust-proof Pouch, Whipping Cloth, User Manual | KN4003B4, UV Googles, Charging Cable, Dust-proof Pouch, Whipping Cloth, User Manual | KN5000C, cord, 6 x shades, UV-proof glasses, 1 x aluminum case and instructions | KN308E, cord, 6 x shades, UV-proof glasses, 1 x aluminum case and instruction |
Details
Delivery: |
Free shipping 7 - 10 Days |
Application: |
Vitiligo |
Setting: |
Home and Travel |
Brand Name: |
Kernel |
Product: |
Portable 308nm Excimer LED PRO for Home and Travel |
Model: |
KN4003B4 |
Certificate: |
FDA Approved |
Wavelength: |
308 nm ± 3 nm |
Light Source: |
UV LED |
Light Intensity: |
40 mw/cm² |
Treatment Size: |
1.24 in² ± 10% |
Treatment Speed: |
8.9X Faster |
Treatment Mode: |
Time and Dosage |
Work Distance: |
1.18 in ± 0.20 in |
Built-in MED Test: |
Y |
Mobility: |
Portable |
Built-in Battery: |
Y |
Battery Life after Fully Charged: |
25 min |
Power Source: |
100-240V |
Screen: |
Basic LED Screen |
Light Source Lifespan: |
≤ 3,000h |
Packing List: |
1 x KN4003B4, 1 x UV Goggles, 1 x Charging Cable, 1 x Dust-proof Pouch, 1 x Whipping Cloth, 1 x User Manual |
Dimension: |
8.66'' H x 2.09'' D x 2.6''W |
Product Weight: |
0.66 lbs |
Warranty
UVB Lamps – Warranty & Return
Product Warranty
- 1-year warranty on the device
- 500-hour warranty on the UV light source
- Includes free parts, replacements, and shipping for manufacturer defects
- Post-warranty repairs may be arranged through Hey Med Supply
This warranty complies with the Magnuson–Moss Warranty Act, which requires that all terms be clearly disclosed.
14-Day Return Policy
- Returns accepted within 14 days of delivery for a refund or exchange.
- Opened or used products cannot be returned unless defective.
- A 20% restocking fee applies to all returns except defective.
- We will repair, replace, or refund defective items free of charge.
Eligible Returns
- Sealed & Unused: The device, original packaging, and all accessories (including user manual and UV-protective glasses) must be in new, unused, and undamaged condition.
- Defective or Damaged: Products that arrive defective or damaged may be returned, even if opened, as long as the issue is reported within 14 days.
Ineligible Returns
We are unable to accept returns if:
- The return is not authorized in advance
- The request is made after 14 days of delivery
- The return is shipped back more than 5 days after receiving authorization
- The product is no longer in “new” condition, including:
- Devices that are damaged
- Missing or damaged original packaging
- Missing or damaged accessories
- Retail packaging with shipping labels or markings applied directly
How to Return
- Initiate a Return
- Contact our team via email or through our website within 14 days of delivery.
- Complete the return form. Reply to your order confirmation email with the form attached, along with any additional details you'd like to share.
- Receive Authorization
- We will respond within 24 hours with approval and return instructions.
- Unauthorized returns will not be accepted.
- Ship Back the Product
- Repack the item with all original components and undamaged, original packaging.
- Place the product box inside a separate shipping box for protection during transit.
- Do not apply labels directly to the product packaging.
- Ship the return within 5 business days of receiving authorization.
- Customers are responsible for return shipping unless the item is defective or damaged.
- Receive Refund
- Refunds are processed within 48 hours of return inspection.
- We reserve the right to refuse returns showing signs of misuse or wear.
- Please allow 2–3 business days for the refund to appear in your account.
- Returns that do not meet our policy criteria may be declined.
Regulatory Compliance
Hey Med Supply complies with all relevant U.S. consumer protection and FDA regulations, including:
- Magnuson–Moss Warranty Act (clear warranty terms and dispute resolution)
- FDA Quality System Regulation (21 CFR Part 820) (device servicing and safety)
- 21 CFR Part 806 (reporting of medical device corrections or recalls)
- Applicable state laws requiring conspicuous return policy disclosures
Product Reviews
-
Recommend
I ordered the KN4003B4 in March to treat vitiligo spots. I’ve been using it twice a week between my doctor’s visits. The light doesn’t produce much heat, so it doesn’t feel alarming, but it can cause skin burns if you're not careful. The vitiligo on my lower chin, around my lips, and on my neck has shown visible re-pigmentation, especially after the patches darkened initially. I'm super excited about the results!
-
It does what it promised!!!
After receiving the LED lamp in April, I’ve been using it to treat psoriasis on my elbows, armpits, and finger knuckles. The most obvious improvement is that there's no more itching and significantly less dryness. The red patches have clearly gotten smaller, though the pigmentation has become darker. I hope that’s just part of the normal healing process.
-
The improvement is better than what I expected
My eczema on my elbows and behind my knees tends to get really irritating during the summer, especially when I’m stressed. I used to pick at the patches until the skin became raw. This spring, I decided to look for a UVB light for home treatment, and so far, the red patches have become softer, and the itching has noticeably decreased.
-
Great product
I started using the LED lamp on March 28, and now it’s been almost two months. To be honest, I didn’t have much confidence in such a small device at first, but I committed fully to sticking with my plan. Now, the vitiligo on my eyebrows and eyelid has reduced to about half its original size, and I’ve started to notice some darker pigmentation forming around those areas. Truly encouraged by the result!
-
The search is over.
I get 308nm UVB therapy treatments at the clinic and had been searching for a 308nm device I could use at home. I’m so glad I found this one! Excited to give it a try and see how it works for me.
-
Excellent customer service
They genuinely care! I had a lot of questions about the product and the delivery, but they patiently answered. Although the confirmation email mentioned a 7-day delivery window, my package arrived in just 4 days, which was a pleasant surprise. I’m really happy with this purchase experience and excited to see how the device works for me. Great job, Hey Med!
-
I will give it a try.
I was getting tired of visiting the doctor’s office three times a week for my vitiligo and wanted to find an excimer laser for personal use. Since clinical lasers are beyond my budget, I’m glad I came across this excimer LED light. It’s said to deliver very similar results to the laser, so I’m excited to give it a try.
-
Lightweight but good quality
It’s about the size of a water bottle and lightweight, making it easy for me to use. The delivery was fast. It arrived in just five days. I have some white spots on my forearms and fingers, so I’m starting treatment there first to see how it goes. Excited to track my progress!
