Planes do not have "headlights" in the way cars do for illumination during the cruise portion of the flight, but they utilize extremely powerful Landing Lights during takeoff and landing. These lights are roughly 100 times brighter than a standard car headlight and are used when the aircraft is below 10,000 feet to help pilots see the runway and to make the plane visible to other aircraft and birds. During the flight, planes use a series of Navigation (Position) Lights—green on the right wing, red on the left wing, and white on the tail—to indicate the plane's direction to other pilots. Additionally, bright red or white Strobe (Anti-Collision) Lights flash constantly to ensure the aircraft is seen from miles away. While in the "taxi" phase on the ground, pilots use separate Taxi Lights, which are narrower and aimed lower to illuminate the path to the gate. Once at cruising altitude, the landing lights are turned off to prevent glare and to save power, as there is nothing in the dark sky for the lights to bounce off of anyway.