Color Temperature: 4300k Lumen output: 3200 Visible lumens Purpose: 4300k bulbs are traditionally used in headlight applications but can be used as auxiliary lights in foglight applications. The 4300k color temperature matches the white color temperature in vehicles that come with factory HID systems. Special note: 4300k bulbs emit the maximum light output possible from HID type bulbs. Higher color temperatures emit fewer lumens. Check out the Gallery for examples of 4300k kits installed in customer cars.