19-04-13, 07:07 PM
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The reflector is behind the bulb not as they used to be in the glass so the CONE stops light being pushed straight out the front of H1 blub crating a dazzle spot. It also improves the light pattern on low beam by forcing as much light as possible back at the reflector. H1 blubs don't have a blacked out nose like H4 on the other side and the light pattern for main beam isn't so critical, most MOT stations don't and haven't bothered looking at the light pattern so they pass without the bulb cone.
Most modern light units have them even cars but they are normally much smaller and use H7 blubs in these applications they are just to improve the light pattern.
(19-04-13, 05:21 PM)NotAnotherHill link Wrote: What is the metal bit meant to do? Does it play a part in direction of the beam or as some kind of heat shield for the headlight lens?
The reflector is behind the bulb not as they used to be in the glass so the CONE stops light being pushed straight out the front of H1 blub crating a dazzle spot. It also improves the light pattern on low beam by forcing as much light as possible back at the reflector. H1 blubs don't have a blacked out nose like H4 on the other side and the light pattern for main beam isn't so critical, most MOT stations don't and haven't bothered looking at the light pattern so they pass without the bulb cone.
Most modern light units have them even cars but they are normally much smaller and use H7 blubs in these applications they are just to improve the light pattern.
Later