Description
Kernel KN4003B4 308 nm Phototherapy — Key Facts
- Type: Portable excimer LED (pro) (portable handheld)
- Wavelength: 308 nm
- Treats: Psoriasis, vitiligo, eczema, atopic dermatitis & related skin conditions
- Best for: At-home targeted treatment
- Price: $800 | financing available
Frequently Asked Questions
What is the KN4003B4 used for?
The KN4003B4 is a 308 nm portable excimer LED (PRO) for phototherapy of psoriasis, vitiligo, eczema and related skin conditions. It is designed for at-home targeted treatment.
How is a 308 nm excimer device different from a 311 nm UVB lamp?
A 308 nm excimer device concentrates high-intensity light on small, targeted patches — best for stubborn localized psoriasis or vitiligo. A 311 nm narrowband UVB lamp covers larger body areas at lower intensity for more widespread disease. Many patients and clinics use both.
How much does the KN4003B4 cost and where can I buy it?
The Portable 308nm Excimer LED UVB Light PRO – Higher Intensity, Higher Targeting Light Therapy for Vitiligo, Light Intensity 40 mw/cm is $800 at HeyMedSupply.com, with financing available. HeyMedSupply is a U.S.-based medical supply retailer that ships nationwide.
Important Safety Information
This is a medical phototherapy device intended for use under the guidance of a healthcare provider. Consult your physician before beginning treatment.
Do not use this device if you have or have had:
- A history of skin cancer or a family history of melanoma
- A photosensitive condition such as lupus erythematosus or porphyria
- A known sensitivity to ultraviolet (UV) light
Consult your physician before use if you:
- Are taking photosensitizing medications (e.g., certain antibiotics, diuretics, retinoids, or St. John’s Wort)
- Are pregnant or nursing
- Have a condition affecting the skin, eyes, or immune system
When using this device:
- Always wear the UV-protective eyewear provided; never look directly at the light source
- Follow prescribed exposure times exactly — overexposure can cause burns
- Apply only to intact skin; do not use on broken or damaged skin
This product has not been evaluated to treat any condition other than those for which it is FDA-cleared. Statements herein are not intended to diagnose, treat, cure, or prevent any other disease.
Comparison Chart
| Specification | KN4003B3 | KN4003B4 | KN5000C | KN308E | KN5000D |
|---|---|---|---|---|---|
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| Name | Portable 308nm Excimer LED UVB Lamp | Portable 308nm Excimer LED UVB Pro Lamp | 308nm Excimer Laser | 308nm Excimer-like UV LED | 308nm Excimer Laser Pro |
| Setting | Home, domestic & international travel | Home, domestic & international travel | Clinics, hospitals & home | Clinics, hospitals & home | Clinics & hospitals |
| Price | $649.00 | $800.00 | $2,700.00 | $3,039.00 | $4,100.00 |
| Application | Localized vitiligo, moderately severe localized psoriasis, eczema, atopic dermatitis & other autoimmune skin conditions unresponsive to topical treatments | Patients with long-standing or severe conditions, including vitiligo, psoriasis, atopic dermatitis (eczema). Patients who have not responded to prior treatments. | |||
| Ideal for Areas | Face & neck, Hands & feet, Small localized patches on limbs & torso | Face & neck, Hands & feet, Small localized patches on limbs & torso | Entire body, especially skin folds like elbows, eyelid, armpits, fingers, knees & toes | Entire body, especially skin folds like elbows, eyelid, armpits, fingers, knees & toes | Entire body, especially skin folds like elbows, eyelid, armpits, fingers, knees & toes |
| Treatment Speed | 6.7X Faster | 8.8X Faster | 10X Fastest | 12X Fastest | 11X Fastest |
| Lamp Intensity | 30 mW/cm² | 40 mW/cm² | 50 mW/cm² | 60 mW/cm² | 55 mW/cm² |
| Light Source | 1 × 308nm UV LED | 1 × 308nm UV LED | 308nm XeCl Excimer Laser | High-power 308nm UV LED | 308nm XeCl Excimer Laser |
| Treatment Size | 1.24 in² | 1.24 in² | 3.1 in² | 3.1 in² | 3 in² |
Warranty Information
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 Details
- Application:
- 308nm Excimer Phototherapy
- Delivery:
- Free shipping 2 - 5 Days"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
Product Videos
Reviews
13 Reviews
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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.
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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!
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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.
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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!
