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 treating vitiligo, moderately severe localized psoriasis, and eczema unresponsive to topical therapy.

Achieve clearer skin and visible repigmentation 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 NB-UVB light therapy—at home or on the go.

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.

Other Product 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.

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.

Treatment Guidelines for Phototherapy

Initial Dose & Incremental Adjustments

1. Vitiligo: 150-200 mJ/cm²
2. Psoriasis: 300 mJ/cm²

Body Areas and Dose Adjustments:

1. 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
2. Hand Palm and Foot: 400 mJ/cm²
   • Increment Adjustments:
     • No redness: +200 mJ/cm²
3. Trunk, Limbs: 200-250 mJ/cm²
   • Increment Adjustments:
     • No redness: +100 mJ/cm²
     • Redness lasting <12 hours: +50 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.

• 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 purchase for a refund or exchange. For hygiene reasons, opened or used items cannot be returned unless they are defective or faulty.

Please note: A 20% restocking fee applies to all returns.

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