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TOPIC: Speedometer illumation

Speedometer illumation 6 years 1 month ago #620

  • Murray
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Hi Gruntie, I agree on the brightness aspect, it's only a bench test at the moment and I did not have the filter on, that will probably make a lot of difference, ( I couldn't put my hands on it just then!) The only problem with the LED's are they are very directional and give a very bright light. Work in progress! but it certainly helps to be able to see the actual speedo needle!
With a spare speedo it's a lot easier to play about and experiment so I am sure I can get to the optimum visual delight!
Murray
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Speedometer illumation 6 years 1 month ago #619

  • gruntie
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It's a matter of opinion, but......I think you're going too bright. The speedo face is illuminated, you don't want that, the numerals should fluoresce on their own and just float in a sea of darkness.

A bit like the pic below: excuse it being a bit dark, crappy camera, but the speedo numerals are on a level with other illumination.

IMG_0006_2015-11-01.JPG
Last Edit: 6 years 1 month ago by gruntie.
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Speedometer illumation 6 years 1 month ago #618

  • Murray
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Just a quick photo of what I have cobbled up and bench testing.
5 UV LED's set in a 1/2 circle of plastic, certainly gives a good impression of what it might be like at the moment.
20151031_164151.jpg
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Speedometer illumation 6 years 11 months ago #419

  • kielyp
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Thank you once again Andy ! That is very useful to know . When those LEDs arrive I have all the information I need to tackle the job !
I will keep you posted on progress and hope to post a photo of the end resul
Thanks also to Gruntie for his input.
Regards from the Emerald Isle ( wet & windy ! )
Pat
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Speedometer illumation 6 years 11 months ago #418

  • clacksman
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Yes Pat, the condition of the fluorescent paint will undoubtedly have deteriorated. I found there was a small improvement after I carefully cleaned the surface of the paint with isopropyl alcohol using an ear bud.

I also found that all the UV LEDs I tried needed to be mounted perpendicular to the black glass. They were highly directional - even the wide angle versions didn't throw much light (UV or visible) laterally, so mounting them in the orientation of the original tungsten lamp was no use at all.
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Speedometer illumation 6 years 11 months ago #417

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Thanks for that Geoff, I see what you mean ! Compared to other bulbs on that site, this one is lowest in terms of " lumens " and the only one available in UV.
As you say, it may well be sufficient to cause the speedo markings to flouresce. i suppose to some extent it will also depend as to what degree the original fluorescent paint has degraded over the years ?
Pat
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