B.C. supermarket’s COVID-19-killing UV cart cleaner a Canadian first Kueler said the Sterilray lamp uses a different UV wavelength than other lights, so it’s not harmful to skin or eyes, but it can disinfect objects with over 99 per cent effectiveness.“It’s a lot more potent for deactivating those nasty bugs,” he said.“We call it the portal — you can place the shopping cart in there, it registers a code that we’ve placed on the shopping cart, and runs through its cycle.”The portal, a modular white aluminum tunnel, which Keuler compared to “a giant EZ-Bake Oven,” has the potential to disinfect more than just carts.“I love innovation and creativity, and (its uses are) almost endless.