The speed of color changing is directly related to the depth and the amount of ultraviolet light encountered. If you have any questions about the product, please feel free to contact us, customer service will answer you within 24 hours. The darkest color changing lens can reduce 80%%Light transmission, reduced by 30% before color changeFor Shark D-Skwal 2 Spartan starryWe are committed to providing the best products and professional after-sales service. Motorcycle Helmet Shield Lens For AGV K3 ECE2206 Helmet Photochromic Visor Face 4olu I.1613713972 Helmet With Photochromic Visor at Linda Recinos blog After exposure to the sun, sunglasses become more handsome! The working principle of color changing lenses is that when exposed to ultraviolet light, the color changing coating on the lens gradually darkens. It is necessary to achieve 30% light transmission before color change, and a completely 0UV environment is required, such as at night. It will darken when exposed to sunlight and brighten when exposed to low light. Please rest assured to buy and wish you a happy life. 1-48 of 391 results for photochromic motorcycle visor Results Check each product page for other buying options. Price and other details may vary based on product size and color Helmets that can change color to 50-80% less light in strong sunlight for up to 30-40 seconds Shark DSkwal 2 Visor Motorcycle Helmet Photochromic Visor Lenses Which Automatically Darkens Clears Helmet Visor For Bell Qualifier Dlx Mip I.1055852146 Photochromic Lens Shark D-Skwal 2