Frequently asked questions

How will I use Violet?

Using a Violet is simple. Step one: Position your hands. Violet will recognize your skin and activate its five-second cleaning cycle.
Step Two: Far UVC Disinfection. Violet uses filitered 222nm skin-safe UV to clean germs from your hands!

Step Three: Complete! Enjoy truly clean hands without water, chemicals, or waste, JustLight.

How will Violet inactivate germs, viruses, and bacteria?

Violets will disinfect your hands & phone in seconds with 222nm Far UV-C light. The high-energy light is readily absorbed by bacteria, germs, viruses, fungi, mold, and microorganisms on your skin. When these pathogens absorb the UV-C light, their DNA is scrambled, rendering them harmless and unable to multiply. We design the 'light dose', or energy per use, to kill germs including SARS-CoV-2, E Coli, MRSA, and other highly dangerous pathogens. UV-C light has been used in industries for decades to disinfect water, medical equipment, and much more. Now, with Far UV-C technology, we can apply this highly effective method of disinfection to clean hands with skin-safe light!

I thought UV light was dangerous?

Ultraviolet is dangerous, to both germs and living human cells. Violet emits specialized Far UV-C light (222nm) in doses too weak to penetrate human skin, but energetic enough to sterilize pathogens on the skin’s surface.

Ultraviolet radiation, or UV light, is an umbrella term for the spectrum of photons with wavelengths between 100 nanometers and 400 nanometers. UV light has shorter wavelengths than visible light and larger wavelengths than X-rays.

UV is broken down into three sub-categories:

UV-A: 315 - 400nm
UV-B: 280 - 315nm UV-C: 100 - 280nm

UV-A contains light such as black light, nail curing light, and tanning booth light. This is longer wavelength UV light that penetrates skin deeply and can cause carcinogenic effects by altering DNA of cells deep within the epidermal layer.

UV-B is the most dangerous part of the spectrum. This is the wavelength generally responsible for sunburns and skin cancer from overexposure while you're outside. UV-B is partly blocked by the atmosphere, but is more prevalent in days with a high 'UV index'.

UV-C, or germicidal light, has higher energy but a smaller wavelength. Short wavelength UV-C light, Far UV-C, rapidly inactivates germs on the skin but is effectively scattered in our top layer of dead skin.

The top layer of your skin is composed of dead skin cells, called the stratum corneum. This layer of skin absorbs excess UV-C light, protecting the other layers of the epidermis (living skin) below. The short-wavelength light Violet will emit is reduced over 99% of its incident energy every 2 microns of stratum corneum. The average human hand has a stratum corneum of 20 - 30 microns thick. Therefore, appropriate wavelengths of Far UV-C Light loses over 99.99% of its energy before it interacts with the human epidermis, underneath the dead skin cell layer. Please note: Violet has not yet been evaluated as an FDA approved product.

Will Violet get rid of grime, dirt, and oils?

No, Violet is intended only for inactivating the DNA or RNA of microorganisms, such as bacteria, viruses, fungi, mold, etc. Soap & water are the best way to remove dirt, grime, oils, and other macro-particles from your hands.
After you wash your hands with soap & water, you will want to use Violet for pathogen deactivation as soap and water struggles to effectively combat germs.

Does Far UV-C light really remove 99.99% of pathogens?

UV-C light inactivates between 0-100% bacteria on your hands, depending primarily on the UV-C dose. A UV-C dose is simply the energy output (photons emitted per second) multiplied by the exposure time (seconds).

If a pathogen is not exposed to a proper UV-C dose (~ 5-30mJ), it will not be inactivated. Violet will be engineered to provide a proper UV-C dose to every square centimeter of your skin. Studies demonstrate that even just 4mJ of Far UV-C light inactivates over 99.9% of SARS-CoV-2, the germ that causes the disease COVID-19.

Studies show that a full 100% sterilization effect is possible with UV-C light. The remaining bacteria only persist if it did not receive a proper UV-C dosage.

I have more questions!

We love questions! Justlight products utliize a lot of complex science and non-intuitive photochemical interactions. Please email any questions to and we will add our answer to the FAQ!