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The BMW Range
3 Series
E90, E91, E92, E93
e90 LCI headlamp Bi-xenon
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<blockquote data-quote="astroboy" data-source="post: 413961" data-attributes="member: 4527"><p><strong>Halogen bulb</strong>: <a href="http://en.wikipedia.org/wiki/Halogen_lamp" target="_blank">http://en.wikipedia.org/wiki/Halogen_lamp</a></p><p><em>The combination of the halogen gas and the tungsten filament produces a chemical reaction known as a halogen cycle (see below) that increases the lifetime of the bulb and prevents its darkening by redepositing tungsten from the inside of the bulb back onto the filament. The halogen lamp can operate its filament at a higher temperature than a standard gas filled lamp of similar power without loss of operating life.</em></p><p></p><p>There's 2 types of light rings bulb, neither is LED:</p><p></p><p>Pre-LCI: 12V10W</p><p></p><p>LCI: 12V35W</p></blockquote><p></p>
[QUOTE="astroboy, post: 413961, member: 4527"] [B]Halogen bulb[/B]: [url]http://en.wikipedia.org/wiki/Halogen_lamp[/url] [I]The combination of the halogen gas and the tungsten filament produces a chemical reaction known as a halogen cycle (see below) that increases the lifetime of the bulb and prevents its darkening by redepositing tungsten from the inside of the bulb back onto the filament. The halogen lamp can operate its filament at a higher temperature than a standard gas filled lamp of similar power without loss of operating life.[/I] There's 2 types of light rings bulb, neither is LED: Pre-LCI: 12V10W LCI: 12V35W [/QUOTE]
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