ABNORMAL BULB OPERATION 1. HID Bulb Flickering Flickering side is typically a result of weak power current. 2. HID Bulb Color Change HID Bulbs dimming on start up is normal. Color lumen will settle in after approximately 5-10 hours of usage. 3. Inconsistent HID Bulb Function If one HID Bulb is intermittently turning on, or delays during start up, ballast may be defective. Try swapping the ballast from the other side to verify.