Description
Comparison Chart
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 Return Policy under the Warranty tab.
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
- Delivery:
- Free shipping 2-3 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
Product Videos
Reviews
19 Reviews
-
OK
Shipping took about 7 days as expected, and the package was delivered neatly and in good condition.
-
Does what it says
The cordless handheld wand is high quality and well made. I’ve been using it for one month, and I’ve noticed less itching on my face—better than any topical cream I’ve tried before.
-
Shipping was the only thing I wish them to improve
The shipping took about 8 days. I’ve been using the cordless lamp for my vitiligo on the face, neck, and along the hairline. Some areas have already started to show signs of repigmentation after a eight weeks of use.
-
Easy to use
This device is perfect for targeted areas on my scalp. I was nervous at first, but I felt comfortable quickly. After about 2 months, My side hairline had a obvious clear-up. Highly recommend it if you're looking for a non-steroid solution.
-
Psoriasis is manageable!
The psoriasis on my scalp and behind my ears was incredibly annoying. It felt like dandruff, but with itchiness and a tight, uncomfortable scalp. In addition to using Dermarest medicated shampoo, vitamin D cream, and olive oil to keep my scalp moisturized, I got this UV hair comb back in December. Oh man I wish I had found it sooner! The comb attachment is super helpful; without it, your hair blocks the UV light from effectively reaching the scalp. Now, I finally feel like my psoriasis is manageable.
-
Effective and great quality
Durable design. I decided to test it out on my arms, palms, and fingers since February. I understand that consistency is key with this kind of treatment, but I’m happy with the results so far. The raised patches on the backs of my hands and forearms have become thinner. I’m hopeful this wand will help me get through the summer with less dryness and itching.
-
Less itching and flaking
After reading the reviews and comparing different products, I decided to try the 4003BL2D to treat my psoriasis around the hairline—and the results have been very promising. I started with the recommended dose of 300 mJ, and once I saw no redness or irritation, I gradually increased the dose by 20% until I noticed a slight redness, as advised. Now, there’s less dryness and flaking along my hairline. I will continue the treatment.
-
It does what it says!
Just like other reviewers mentioned, it takes a little time to learn how to use the machine. It can be a bit intimidating at first, especially when you’re concerned about not harming your skin. But the results speak for themselves. I’ve been using the 4033BL2D for three months now, and the thick, dandruff-like flaking has become noticeably thinner. Now, I only experience mild dryness and occasional itching. I’m really pleased I gave this device a try!
-
Good quality and neat design
The delivery was faster than expected. A friend recommended that I should also try this narrowband UVB lamp. It takes some time to figure out how to use the lamp to treat the skin. Let's see how my skin improves.