little_duke
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Registered: 21st Aug 06
Location: Tamworth,staffordshire Drives: rover coupe
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quote:
Originally posted by 16V_1600
quote:
Originally posted by Bonney66
Try the interior light dimmer switch by the headlight adjustment, near the switch
If that doesn;t work, try the leds, are they in the housings properly 
The dimmer switch doesn't make any diff to LEDs. It doesn't on mine anyway.
nor mine 
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gavin18787
Premium Member
Registered: 22nd Feb 05
Location: Basildon, Essex
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I would go with them just been dimmer led's then your mates tbh
Drives supercharged Tec with torque  
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Oddjob
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Registered: 4th Jun 08
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Course LEDs dim. If you reduce the voltage then the resistor has less current to counter, hence the LED dims. If you go too low on the voltage then they will go out. My speedo has close to 60 LEDs in it and believe me you can really see them dimming when the dimming wheels turned.
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Daveskater
Premium Member
Registered: 29th Apr 08
Location: Oxford, UK Drives: Jap wagon
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Make sure the dimmer's all the way at the top then
Numberwang!
Originally posted by AlunJ
I like you Dave, you are a man of men
Originally Whatapp'd by Neo
Dave's maybe capable of a drive-by cuddle
Look at my pictures
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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If they're dimming it's probably because you're not regulating them sufficiently well and they're operating above their design tolerance. This will mean they're getting hot and will fail earlier.
Cheap way of achieving more brightness but watch you don't melt the plastic or cause a dash fire.
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Oddjob
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Registered: 4th Jun 08
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No Ian I know what I'm doing with LEDs, they are all regulated to 14.4v. LEDs dim, it's not rocket science, as the voltage drops the resistor still keeps resisting up to it's capacity, so the voltage drops to say 2.3v, hence the LED dims as the semi conductor in the die gets less voltage.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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If they're designed to run at 14.4v then sound. Try doing it with a 20ma 2v cheapo one.
I'm also not convinced that you'll a full range of dimming like you do with the incandescents. The range of operating voltage is not sufficiently wide. If you wanted proper dimming on an LED you would need to pulse the supply with a 555 or similar which of course is not how the dimmer unit works unless you modify it.
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Oddjob
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Registered: 4th Jun 08
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I don't think that really matters though Ian. The question was do LEDs dim, they do and are perfectly capable of it, running them dim actually extents their life due to them producing less heat.
Ok a car dimmer isn't perfect, but it does the job I suppose.
Where do I know your name from Ian? seems strangly familiar for some reason. You had a feature car in a car mag?
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