STET CLEAN is composed of:

Stet Clean, thanks to a cutting-edge technology, is one of the first device in the world to employ germicidal LED UV.

Traditional disinfection methods are currently limited to wiping the membrane with a solution of 70% isopropyl alcohol and soapy water or with other chemical disinfectants.

For the first time, the innovation introduced by Stet Clean revolutionizes the practices linked with the use of the most common medical instrument through application of LED UV-C technology.

The action of Stet Clean begins immediately, as soon as it comes in contact with the stethoscope: establishing a series of sensor controls, activation of the LED UV-C begins an immediate disinfection of the membrane, thanks to the emission of a specific length of the UV-C wave that deactivates the DNA of microorganisms.

The unique, patented, geometric configuration of the Stet Clean cone allows the membrane of the stethoscope to be efficiently disinfected. Laboratory trials have shown how in just 60 seconds the Stet Clean technology is able to deactivate 85.5% of E. faecalis, 87.5% of S. aureus, 94.3% of E. coli, and 94.9% of P. aeruginosa (AJIC – American Journal of Infection Control); increased exposure times guarantee even higher levels of disinfection (more than 99%).


The first wearable automatic device for stethoscope disinfection, specifically designed to ensure security and deep hygiene to patients thanks to the action of UV-C LED.



Ultraviolet rays are electromagnetic waves which are part of light. Electromagnetic waves are divided into three main wavelength bands, expressed in nanometers, nm: Ultraviolet rays (UV) 100-400 nm Visible rays (light) 400-700 nm Infrared rays (IR) 700-800,000 nm UV rays are in turn identified in three bands:

  • UV-A (315-400 nm) with tanning properties;
  • UV-B (280-315 nm) con proprietà terapeutiche e di sintesi della vitamina "D";
  • UV-C (100-280 nm) with germicidal properties.

UV-C rays (100-280 nm) have a strong germicidal effect and reach their maximum efficacy at the 265 nm wavelength. The germicidal effect of UV-C radiation covers bacteria, viruses, spores, fungi, moulds and mites; this is mainly due to the destructive effect of the UV-C rays on their DNA, which damage their reproductive system and prevent them from replicating.

Bacteria, Viruses, Spores, Fungi, Mould, and Mites are all sensitive to, and can therefore be eliminated with, UV-C light. Mircrobes cannot acquire resistance to UV-C light, unlike that which occurs using chemical disinfectants and antibiotics. UV rays are ecological. Polluting the environment is inevitable using normal disinfectants. Directly inhaling the vapours, or swallowing food products contaminated by any contact with said chemical disinfectants, can also give rise to a number of serious risks. In cases where chemical disinfectants cannot be eliminated (food, pharmaceutical, healthcare industries, etc.), using ultraviolet rays for disinfection allows a reduction in their use, with considerable economic savings and greater care for the environment, while maintaining and almost always improving the level of disinfection. UV-C light devices can be installed in environments and on machinery and be programmed to maintain the same level of disinfection day and night, guaranteeing ideal hygiene conditions, without highs and lows. On the contrary, chemical disinfectants are effective only during their actual use. Using LIGHT PROGRESS equipped luminaires, operating costs are negligible; it could be said that “LIGHT PROGRESS” UV-C systems do not require maintenance except for the normal replacement of the lamps. The cost/benefit ratio is considered excellent; the devices are both powerful and long-lasting. Hence the elimination of germs using UV-C technology is low-cost and highly effective compared to (or in combination with) other systems.

UV-C light genuinely works if properly applied and with the necessary precautions. The difference between a quality project, and an application that fails to bring the desired results, lies in the degree of knowledge about the subject, and level of experience acquired over time. Light Progress has been developing successful projects worldwide since 1987, and has built a client portfolio consisting of important companies in all fields requiring certified hygienic conditions to produce quality products and services.