Knog blinder arc 640 front lightfor serious road and trail riders the blinder arc 640 is the top of the range knog light loaded with 640 lumens of light the arc 640 lets riders see and be seen all from a usb rechargeable 100 waterproof integrated silicone package using 16 vertical and 24 horizontal beams ensures riders light up the path ahead featuresmaterials polycarbonate housing and pmma lens hard anodised aluminium fascia uv resistant siliconelight output 220 lumensdimensions 3