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LEDs
Nov 2, 2015 17:28:02 GMT
Post by gingerbeer62 on Nov 2, 2015 17:28:02 GMT
Just fitted LED panel lights to my Rover. Great improvement and easy to see now. Cheers Colin  |
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Post by barryr on Nov 2, 2015 23:15:16 GMT
Looks nice - presumably they are no longer dim able by the rheostat?
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LEDs
Nov 3, 2015 8:29:52 GMT
Post by gingerbeer62 on Nov 3, 2015 8:29:52 GMT
Looks nice - presumably they are no longer dim able by the rheostat? Not sure about that as never had the rheostat connected anyway. They do look ok though. Not too bright. Cheers Colin |
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Nov 3, 2015 8:54:50 GMT
Post by johnwp5bcoupe on Nov 3, 2015 8:54:50 GMT
Looks nice - presumably they are no longer dim able by the rheostat? They have to be able draw a given current Barry this is calculated by the in line resistance and the voltage applied at some point they will just switch off if you lower the voltage! They look good  but I have got used to candlelight  |
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Post by guidedog on Nov 3, 2015 9:13:11 GMT
A miners helmet works as well John.
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Post by barryr on Nov 3, 2015 21:13:23 GMT
Tell me about it John - I've had fun with dim able LEDs in my kitchen. They necessitated a special dimmer as well as lamps and at max brightness one starts to flash! - if I swapped it out with another lamp in the chain that one flashed as well! Bizarre things. I have a house full of them now though. I wired our entire house and had my electrician mate check it all through. It's great to know where every wire goes! Sorry all back to topic  ? |
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Post by djm16 on Nov 3, 2015 22:30:55 GMT
Dimmable LEDs.
A perfect diode will start conducting at exactly its operating voltage (around 0.4V for a silicon diode). Increasing the voltage by a minuscule amount will then cause an infinite current to flow.
As diodes go, LEDs are less than perfect. As LEDs go, the stacked RGB arrays that make up "white" LEDS are even less perfect. Meaning that they are not fully conducting at exactly one voltage, but decrease their resistance over a range of voltages (ball park figure 2.5 to 3.5V).
Secondly, low power LED assemblies designed to work in a 12V car system likely will have a current limiting resistor in series so that the forward voltage across the LED can remain in the safe range while the current will be determined by the applied voltage.
In short, low power 12V white LEDs are dimmable.
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Nov 4, 2015 10:00:08 GMT
Post by johnwp5bcoupe on Nov 4, 2015 10:00:08 GMT
If the 12v supply from the Rheostat was a stable 0 to 12v I would agree but due to the design and the age of the Rheostat it would be mostly and on off in various places so yes they may dim? worth a try!
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Post by djm16 on Nov 4, 2015 22:56:57 GMT
Rheostats are easy to disassemble. The NiCr wire can then be cleaned with phosphoric acid and it will work well once again. - done this for three cars already.
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Nov 5, 2015 0:50:08 GMT
via mobile
Post by enigmas on Nov 5, 2015 0:50:08 GMT
If you thought the above illumination is good take a look at this refurbished (UV LED conversion) ZA ZB Magnette speedo. www.mgexp.com/phorum/read.php?27,1765852,page=4 |
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LEDs
Nov 5, 2015 9:13:39 GMT
Post by johnwp5bcoupe on Nov 5, 2015 9:13:39 GMT
Rheostats are easy to disassemble. The NiCr wire can then be cleaned with phosphoric acid and it will work well once again. - done this for three cars already. I have a new one I will have a play! there are a few led's in my toy box but I think for the desired effect needed and the cut off voltage of the led's?? I would think the Rheostat resistance may be totally wrong for the effect required due to the much lighter load? but worth a play  as I am a bit limited as to what I can do at the moment  |
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LEDs
Nov 5, 2015 18:50:38 GMT
Post by Phil Nottingham on Nov 5, 2015 18:50:38 GMT
I fitted Leds years ago - try SEARCH - they do part dim though no point but are superior
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Post by barryr on Nov 5, 2015 22:46:51 GMT
You are limited John? - what are you up to? Lol
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Nov 6, 2015 16:37:20 GMT
Post by p5rover on Nov 6, 2015 16:37:20 GMT
Just fitted LED panel lights to my Rover. Great improvement and easy to see now. Cheers Colin Looks good, were did you get them from? and are they just a straight swap? or do the fittings need changing also? |
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Post by gingerbeer62 on Nov 6, 2015 18:21:49 GMT
Just fitted LED panel lights to my Rover. Great improvement and easy to see now. Cheers Colin Looks good, were did you get them from? and are they just a straight swap? or do the fittings need changing also? They are a straight swap. I got the 6 main ones from e-bay www.ebay.co.uk/itm/181690953113?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT4 for the coupe dials and one each for the main gauges Then 5 for the switches inclusive of the clock. Unfortunately can't remember where I got those from. But looks like this. Cheers Colin  |
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Nov 6, 2015 22:31:09 GMT
Post by enigmas on Nov 6, 2015 22:31:09 GMT
Thanks for the link and the info Ginger beer...nice and straight forward...plug and play...no fiddling! Good stuff. |
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Nov 7, 2015 9:17:01 GMT
Post by guidedog on Nov 7, 2015 9:17:01 GMT
They look really good. Just ordered. I can take my miners helmet off now. |
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but I have got used to candlelight 
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as I am a bit limited as to what I can do at the moment 
