X1 Replacement Lens - Lumalens Photochromic AmberLumalens Photochromic Amber Lens Variable Light Transmission (VLT) 16 66% For all conditions SKU 39355 591 Expand your experience with the Lumalens Photochromic adaptive lenses that give you a visual advantage. The adaptive lenses automatically change colour and tint in response to changing light and weather conditions. Lumalens Photochromic adaptive lenses automatically darken in bright sunlight and lighten in overcast cloudy weather. The process is