bassett
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| posted on 7/4/09 at 12:36 PM |
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Converting gauge bulbs to LED
Hi, my dash contails the r1 clock, savage switches and some smiths telemetrix gauges. All but the gauges are led, instead just having a dim yellowy 2w
bulb. is it difficult to upgrade these to LED's to match the rest?
Cheers
Adam
[Edited on 7/4/09 by bassett]
My MNR Blog Updated Jan 2010 - Track Day Prep Begins!
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02GF74
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| posted on 7/4/09 at 12:43 PM |
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it can be done in a number of ways.
buy LED replacement bulbs, can be £££ plus posswibly you may not find small ones like the ones you need; unlikely as there a lots of differnet types
out now.
also you may be limited to colour choice.
other way (and locost) is to make you own bulbs - see my thread on this - these wherre to dash lamps thouygh.
for the instruments I used 2 3 mm LEDs pused into the hole and held in place with rubber foam stuff - not had any problems so far.
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vinny1275
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| posted on 7/4/09 at 12:43 PM |
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was looking around for replacement LEDs for Savage switches last night, and depending on teh bulb type you need to replace, there may well be a direct
replacement for it on Ebay - just search for 12V LED
How's the re-test work coming along?
Cheers
Vince
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mad4x4
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| posted on 7/4/09 at 02:10 PM |
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By an LED from Maplin and a resistor
V= i x R therefore R = v / i
typlical current for an LED (unless low current) is 20mA (0.020A) so
Typically to get 20mA at 13V (alt running) you would need a 550 Ohm Resistor. This is split as 11v dropped over Resistor and 2v dropped over LED. As
you don;t get a 550Ohm resistor typically 560Ohm Is closest giving 19.6 mA through the LED.
For a "dimmer" led (not so bright reduce the current to 10mA and the resistor doubles to 1100Ohms or 1.1K
See More about the Black art of resistors and LED's <- LINK
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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damajin
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| posted on 7/4/09 at 02:21 PM |
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That's what I did too... I just took an old bulb (a blown one I was struggling to replace) broke the glass bit off with pliers (careful now) and
wired in a 5mm LED and resistor into the metal casing using some heat shrink to prevent shorts and a glue gun to hold it all in place. Also worth
rubbing the LED over with a bit of wet and dry to roughen the surface as this diffuses the light better.
D
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