Description
Kernel Handheld 308nm Excimer LED UVB Lamp, Light Intensity 30 mw/cm² – KN4003B3 – Higher Intensity, Higher Targeting, Precise Phototherapy for Localized Vitiligo on Face, Hands and Feet
Introducing the 308nm Excimer LED Lamp, KN4003B3 – 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, KN4003B3 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
Product Highlights
Convenient, Effective Alternative to Frequent Doctor Visits
- Utilizes 308nm Excimer LED light, 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 KN4003B3 ensures precise treatment, focusing on affected skin while protecting surrounding healthy areas.
User-Friendly Time-Based Dosage Control
- Designed with time mode, allowing users to adjust each treatment session's duration to achieve the recommended dosage for their specific condition.
Other Product Features
✔ Stable & Long-Lasting Light Source – High-quality LED technology ensures a consistent, reliable 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 35 minutes of uninterrupted use per full charge without losing intensity.
Why 308nm is better than 311nm?
- Faster Results – 308nm delivers stronger energy per second than 311nm. On average, it 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 painless, with only a slight warming sensation. It is safe for children, infants, and even pregnant women.
Treatment Guidelines for Phototherapy
Initial Dose & Incremental Adjustments
- Vitiligo: 150-200 mJ/cm²
- Psoriasis: 300 mJ/cm²
Body Areas and Dose Adjustments:
- Face and Perineum: 150-180 mJ/cm²
- Increment Adjustments:
- No redness: +50-80 mJ/cm²
- Redness lasting <12 hours: +30-50 mJ/cm²
- Redness lasting 1 day: Maintain dose
- Redness lasting >1 day: Reduce dose
- Increment Adjustments:
- Hand Palm and Foot: 400 mJ/cm²
- Increment Adjustments:
- No redness: +200 mJ/cm²
- Increment Adjustments:
- Trunk, Limbs: 200-250 mJ/cm²
- Increment Adjustments:
- No redness: +100 mJ/cm²
- Redness lasting <12 hours: +50 mJ/cm²
- Increment Adjustments:
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: 30 mW/cm²
- MED Formula: Irradiation Time (seconds)=Dose (mJ/cm²) ÷ Lamp Intensity (mW/cm²)
Treatment Protocols
- Psoriasis:
- Frequency: 3-4 times/week
- Treatment session: 15-20 times
- Vitiligo:
- Frequency: 2-3 times/week
- Treatment session: 30-50 times or more
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.
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 for Home and Travel |
Model: |
KN4003B3 |
Certificate: |
FDA Approved |
Wavelength: |
308 nm ± 3 nm |
Light Source: |
UV LED |
Light Intensity: |
30 mw/cm² |
Treatment Size: |
1.24 in² ± 10% |
Treatment Speed: |
6.7x Faster |
Treatment Mode: |
Time |
Work Distance: |
1.18 in ± 0.20 in |
Built-in MED Test: |
Y |
Mobility: |
Portable |
Built-in Battery: |
Y |
Battery Life after Fully Charged: |
35 min |
Power Source: |
100-240V |
Screen: |
Basic LED Screen |
Light Source Lifespan: |
≤ 3,000h |
Packing List: |
1 x KN4003B3, 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 – Returns & Warranty
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.
- Include your order number, reason for return, and confirmation of the product's condition.
- 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.
- 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
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Exactly what I was looking for
In addition to visiting the clinic, I wanted a device I could use while on the road to continue the same 308nm phototherapy treatment I receive. This lamp is very lightweight and doesn’t take up much space in my luggage, making it perfect for travel.
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Fast enough delivery
I had no idea where to find a quality narrowband UVB lamp for my vitiligo until a friend recommended Hey Med. I can’t wait to try it out and see how it works on my skin!
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Recommend.
I compared several devices and decided to give the LED lamp a try. I wanted my own machine to maintain my vitiligo between doctor’s visits. After three weeks of use, I haven’t experienced any side effects. The built-in skin test at the beginning is especially helpful in avoiding overuse.
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No regret at all!
I used to visit my doctor’s office three times a week for vitiligo treatments on my face and hands, but I really wanted a device to treat myself at home. Hey Med recommended their Excimer LED, and I have no regrets! The 308nm Excimer LED works just like the 308nm Excimer Laser, which is exactly what I was receiving at the clinic. The device is small, lightweight, and easy to use. I’ve been able to manage my pigmentation and even see further improvements after 2 months. Highly recommend it for anyone looking for a 308nm UV lamp!
