Gants recommandé, pour éviter de mettre du gras sur l'ampoule.
Des lunettes de sécurité, car l'ampoule est sous haute pression.
Recycler les ampoules, car elle contiennent du mercure et différents sels.Operation selon Wikipedia
HID headlamp bulbs do not run on low-voltage DC current, so they require a ballast with either an internal or external ignitor. The ignitor is integrated into the bulb in D1 and D3 systems, and is either a separate unit or part of the ballast in D2 and D4 systems. The ballast controls the current to the bulb. The ignition and ballast operation proceeds in three stages:
1. Ignition: a high voltage pulse is used to produce a spark – in a manner similar to a spark plug – which ionises the Xenon gas, creating a conducting tunnel between the tungsten electrodes. Electrical resistance is reduced within the tunnel, and current flows between the electrodes.
2. Initial phase: the bulb is driven with controlled overload. Because the arc is operated at high power, the temperature in the capsule rises quickly. The metallic salts vapourise, and the arc is intensified and made spectrally more complete. The resistance between the electrodes also falls; the electronic ballast control gear registers this and automatically switches to continuous operation.
3. Continuous operation: all metal salts are in the vapour phase, the arc has attained its stable shape, and the luminous efficacy has attained its nominal value. The ballast now supplies stable electrical power so the arc will not flicker. Stable operating voltage is 85 volts AC in D1 and D2 systems, 42 volts AC in D3 and D4 systems. The frequency of the square-wave alternating current is typically 400 hertz or higher.Burners types selon Wikipedia
HID headlamp burners produce between 2,800 and 3,500 lumens from between 35 and 38 watts of electrical power, while halogen filament headlamp bulbs produce between 700 and 2,100 lumens from between 40 and 72 watts at 12.8 V.
Current-production burner categories are D1S, D1R, D2S, D2R, D3S, D3R, D4S, and D4R. The D stands for discharge, and the number is the type designator. The final letter describes the outer shield. The arc within an HID headlamp bulb generates considerable short-wave ultraviolet (UV) light, but none of it escapes the bulb, for a UV-absorbing hard glass shield is incorporated around the bulb's arc tube. This is important to prevent degradation of UV-sensitive components and materials in headlamps, such as polycarbonate lenses and reflector hardcoats. "S" burners – D1S, D2S, D3S, and D4S – have a plain glass shield and are primarily used in projector-type optics. "R" burners – D1R, D2R, D3R, and D4R – are designed for use in reflector-type headlamp optics. They have an opaque mask covering specific portions of the shield, which facilitates the optical creation of the light/dark boundary (cutoff) near the top of a low-beam light distribution. Automotive HID burners do emit considerable near-UV light, despite the shield.How to Test an HID Bulb Instructions
1. Examine the bulb for signs it has burned out. A mercury HID bulb exhibits a blackening at the end of the arc tube. High-pressure-sodium lamps and metal-halide lamps do not exhibit obvious symptoms when power is off.
2. Check the specifications on the ballast. An incorrect lamp-and-ballast combination will exhibit the same symptoms as a bad bulb. If the bulb is rated at 100 volts and 150 watts, the ballast characteristics must match.
3. For high-pressure sodium lamps, use a known good bulb to first ensure the ballast and starter are operable. Once verified, insert the suspect bulb and test operation.
Read more : http://www.ehow.com/how_6617121_test-hid-bulb.htmlHigh Pressure Sodium Lamps
At the end of life a high pressure sodium lamp goes through a process called on-cycling. The lamp will begin to draw up more energy to operate than what the ballast can provide. Once the ballast reaches its maximum output the lamp will extinguish. After a cool down period the lamp will restart and continue the cycle.
Read more : http://www.ehow.com/list_6833083_symptoms-bad-hid-bulb.html
J'ai trouvé plusieurs fichiers .pdf très intéressants sur le diagnostique, alors ils seront sur mon drive, pour ceux qui ont accès. HID sur Drive