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This is an OE plug and play upgrade, whiter and brighter than stock. Current OE bulb will be 25W 4300K, this is 35W 5500K, giving you a 40% increase in output. Bulbs should be installed in pairs so the output colours match. Please note: Not compatible with automatic mode, must turn headlight switch to On position., BrightSource D5S Upgrade 35W 5500K - Twin Pack. If you want the less white colour please see Part Number #D5S43.HID kits are the brightest aftermarket light with an output of approximately 6500 lumens. The BrightSource bulb is unique. The glass tube features a patented spheroid arc design that focuses light on the reflector of the vehicle headlight better than LEDs and competing HID products. This makes for less glare and better light on the road., 5500KHID kits are the brightest aftermarket light with an output of approximately 6500 lumens. The BrightSource bulb is unique. The glass tube features a patented spheroid arc design that focuses light on the reflector of the vehicle headlight better than LEDs and competing HID products. This makes for less glare and better light on the road., 4300KHID kits are the brightest aftermarket light with an output of approximately 6500 lumens. The BrightSource bulb is unique. The glass tube features a patented spheroid arc design that focuses light on the reflector of the vehicle headlight better than LEDs and competing HID products. This makes for less glare and better light on the road., 6000KHID kits are the brightest aftermarket light with an output of approximately 6500 lumens. The BrightSource bulb is unique. The glass tube features a patented spheroid arc design that focuses light on the reflector of the vehicle headlight better than LEDs and competing HID products. This makes for less glare and better light on the road., 4300KHID kits are the brightest aftermarket light with an output of approximately 6500 lumens. The BrightSource bulb is unique. The glass tube features a patented spheroid arc design that focuses light on the reflector of the vehicle headlight better than LEDs and competing HID products. This makes for less glare and better light on the road., 6000KHID kits are the brightest aftermarket light with an output of approximately 6500 lumens. The BrightSource bulb is unique. The glass tube features a patented spheroid arc design that focuses light on the reflector of the vehicle headlight better than LEDs and competing HID products. This makes for less glare and better light on the road., 4300KHID kits are the brightest aftermarket light with an output of approximately 6500 lumens. The BrightSource bulb is unique. The glass tube features a patented spheroid arc design that focuses light on the reflector of the vehicle headlight better than LEDs and competing HID products. This makes for less glare and better light on the road., 6000K