GF82.10-P-2007-01SKX Xenon Headlamps, Function

GF82.10-P-2007-01SKX Xenon Headlamps, Function
- with CODE (614) Bi-xenon headlamp unit


When the low beam is switched on, the HRA power module (E1n3) and the HRA power module (E2n3) activate the Xenon headlamp ignition module (E1n2) and the Xenon headlamp ignition module (E2n2) within a few milliseconds via the control voltage. A high-voltage surge from the ignition device ignites the xenon lamps, and in doing so an electric arc is formed between the electrodes. If an arc with adequate stability is detected, the control electronics of the HRA power module (E1n3) and the HRA power module (E2n3) switch to power-limiting mode. The light that is generated in a gas discharge lamp is not reflected by the Bi-xenon headlamp but is led directly through the lens optics. A voltage transformer generates the voltage required for reliable xenon lamp operation. 'For the low beam the bottom half of the light beam is covered by a shield. This prevents oncoming traffic from being dazzled.

When switching over to high beams, the shield is moved away downwards so that the entire light flux is available. The shield is actuated electromechanically via the left high beam solenoid (E1l1) and the right high beam solenoid (E2l1). In order to make the extremely bright light more acceptable to other road users, the lens aperture area with its dotted characteristic is optically enlarged. This is possible on account of the specially formed areas which surround the lens. In addition, the light can pass through a number of chrome-plated strips from the rear. A portion of the diffused light is intercepted by the lower section of the surface area and reflected to the upper section of the chrome-plated longitudinal strips.

For technical reasons the xenon lamp has a timed startup characteristic. 50% of the brightness is reached approximately 2 seconds after switching on, and full brightness is reached after approximately 30 seconds.