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.