Description
Kernel Cordless, Portable 311nm UVB Lamp, Light Intensity 4.5 mW/cm² – KN4003BL2D – Ideal Scalp Light Therapy
The use of 311nm narrowband ultraviolet B (NB-UVB) light has been clinically proven and used for nearly 12 decades as an effective treatment for various skin conditions, including:
- Psoriasis
- Vitiligo
- Eczema
- Parapsoriasis
- Atopic dermatitis
- Pityriasis rosea
Experience medical-grade phototherapy sessions in the comfort of your home. This device helps accelerate healing and relieve the unpleasant symptoms associated with skin conditions.
- 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
Key Features
- Cost-effective, medical-grade UVB lamp
Equipped with a Philips 311nm NB-UVB bulb, KN4003BL offers entry-level home phototherapy ideal for treating smaller areas such as the scalp, hairline, face, neck, hands, and feet.
- Ideal for scalp treatment
With the portable design and the removable comb attachment that parts the hair, KN4003BL2D allows UV light to effectively reach the scalp.
- Rechargeable and Travel-friendly
Compatible with 110V–240V, the KN4003BL2D offers global voltage adaptability. Once fully charged, it operates for up to 90 minutes without any loss in light intensity. Enjoy consistent, reliable light therapy at home or on the go.
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 KN4003BL2D Lamp Intensity: 4.5 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 and 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 | KN4003BL2D | KN4006B | KN4006BL1D | KN5000C |
 |
 |
 |
 |
 |
|
| Setting | Home and domestic travel | Home, domestic and international travel | Home | Home, domestic and international travel | Clinics, hospitals and home |
| Name | Corded, Handheld 311nm UVB Lamp | Portable, Handheld 311nm UVB Lamp | Corded, Stationary & Handheld 311nm Double UVB Lamps | Portable, Handheld Double UVB Lamps | 308nm Excimer Laser - Highest Intensity and Precision |
| Price | $288.44 | $319 | $365 | $460 | $2999.48 |
| Application | - Psoriasis - Vitiligo - Eczema and other Atopic dermatitis - Pityriasis Rosea and Tinea Capitis |
– Patients with a longer history of more severe conditions, such as Psoriasis, Vitiligo, Eczema, Pityriasis Rosea, Atopic dermatitis and Tinea Capitis. – Patient who have not seen any improvement from other treatments. |
|||
| Treatment Area |
- Scalp and hairline - Face and neck - Hands, feet and relevantly smaller skin areas |
- When the lamp is on the station: hands, feet, back, shoulders, and other hand-free or hard-to-reach areas - When the lamp is removed from the station: hands, arms, legs, torso, and other large skin areas |
- Face and neck - Hands and feet - Torso, limbs and large skin areas |
Entire body, including hard-to-target areas such as elbows, eyelid, armpits, fingers, knees and toes |
|
| Treatment Speed | Fast | Fast | 1.2X Faster | 1.2X Faster | 11X Fastest |
| Lamp Intensity | 4.5 mw/cm² | 4.5 mw/cm² | 5.5 mw/cm² | 5.5 mw/cm² | 50 mw/cm² |
| Light Source | 1 x Philips 311nm ± 3nm Bulb | 1 x Philips 311nm ± 3nm Bulb | 2 x Philips 311nm ± 3nm Bulbs | 2 x Philips 311nm ± 3nm Bulbs | 308nm xeCl Excimer Laser 308nm ± 2nm |
| Treatment Size | 8.5 in² ± 10% | 8.5 in² ± 10% | 16 in² ± 10% | 16 in² ± 10% | 3.1 in² ± 10% |
| 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 70 minutes | Corded | Cordless, Built-in Rechargeable Battery, up to 40 minutes | Corded |
| Light Source Lifespan | ≥ 500h | ≥ 500h | ≥ 500h | ≥ 800h | ≥ 500h |
| Package | UVB lamp, cord, UV-proof glasses, instruction | UVB lamp, charger, UV-proof glasses, instructions | UVB lamp and station, cord, UV-proof glasses and instruction | UVB lamp, distance holder, charger, UV-proof glasses and instructions | Excimer Laser 308nm, cord, 6 x shades, UV-proof glasses, 1 x aluminum case and instructions |
Details
Delivery: |
Free shipping 7 - 10 Days |
Application: |
Psoriasis, Vitiligo, Eczema, Pityriasis Rosea, Atopic Dermatitis |
Treatment Area: |
Scalp, Face, Hands and Feet |
Brand Name: |
Kernel |
Product: |
Cordless, Portable 311nm Narrowband UVB Lamp |
Model: |
KN4003BL2D |
Certificate: |
FDA Approved |
Wavelength: |
311 nm ± 3 nm |
Light Source: |
1 x Philips Light Bulb |
Light Intensity: |
4.5 mw/cm2 |
Treatment Size: |
8.5 in² ± 10% |
Treatment Speed: |
Fast |
Treatment Mode: |
Time |
Work Distance: |
1.18 in ± 0.20 in |
Built-in MED Test: |
N |
Mobility: |
Portable |
Built-in Battery: |
Y |
Battery Life after Fully Charged: |
70 min |
Power Source: |
Adaptable to Voltage Range 100-240V |
Screen: |
Basic LED Screen |
Light Source Lifespan: |
≤ 500h |
Packing List: |
1 x KN4003BL2D, 1 x UV-proof Goggles, 1 x Charging Cable, 1 x User Manual |
Dimension: |
12.99'' L × 2.28'' W × 1.83'' H |
Product Weight: |
1.98 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
-
The cordless works great!
I compared several models but ultimately chose this cordless version for its convenience. After about 30 sessions (3 months), I’ve noticed that the flaky skin on my scalp and elbows has smoothed out. The patches on my neck and arms have been healing more slowly, but I’m still really happy with the progress. Even though it takes time, I prefer light therapy over oral medications. Definitely worth trying.
-
It Worked!
The psoriasis on the back of my neck and behind my ears flared up because I didn't apply enough sunscreen, so I started looking for a way to speed up the healing process. Thankfully, I found this UVB lamp, and after nine sessions, the irritation has started to calm down. I’ll continue using it to further improve my skin!
-
Works great!
Pros: Portable and lightweight. My arm doesn’t feel sore even after holding it up to treat my vitiligo spots on my cheeks, lips, and around my eyes. After two months of use, we’ve seen obvious improvements in those areas—less pigmentation than before, especially around my mouth. Very happy with the results! Cons: I wish the light were stronger for faster results and that the lamp were smaller to better target affected areas while protecting healthy skin.
-
Easy to use.
I wasn't sure how to use it at first, but thankfully, the customer service team guided me through the process. To get the best results, you’ll need to adjust your treatment time—increasing, maintaining, or decreasing it based on how your skin reacts. Hopefully one day they can upgrade the design and people set the dose directly on the machine.
-
Psoriasis on scalps and forehead
You need to be patient and consistent to see improvements in your skin, but once they appear, you’ll know the time was well worth it! The itchy, dry skin on my hairline and forehead has significantly improved, and I feel so much relief.
-
Recommend!
This machine is not a facade. It achieve the same result as I did at the doctor’s office. I have used it for 3 months to treat the skin behind my ear because of it's portable. The size of red spots behind my ears reduced and less swollen.
-
Scalp machine
This comb has been really helpful in treating the psoriasis on my scalp, thanks to the comb attachment. It also helps me maintain the right distance for effective use. I've noticed a reduction in dandruff and itching in only two months!
-
Portable. Handheld is well made
The device is easy to use for treating spots on the back of my neck and near the scalp because it's portable. I have completed 15 sessions following the user manual and already feel much better. The irritation and pain have decreased. Customer Service cares a lot. My package wasn’t delivered without a signature requirement the first day. They proactively worked with DHL for me before I even reached out.
