Philips 891 Standard Fog Bulb (Pack of 1) Original equipment quality seal for the most reliable performance Always replace in pairs to ensure a symmetric light beam from both bulbs on the road. Headlights dim over time. Headlight bulbs by Philips, for over 100 years we have been continuously innovating automotive lighting When installing a new bulb, never touch the glass. Either use gloves or paper towel when handling.