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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 06:47
 
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MCD is the output of the LED in terms of 'milli-candela', ie candle power...
read this
http://www.dialight.com/faqdisp.tpl?page=optoelect ronics&searchcase=1
i would go for a much higher output, but it also depends exactly where you are putting them... you could put a lot of low output LED's around the dials, or maybe use a few high output LED's in place of the globes. globes have a pretty high output to start with, and also have the benefit of having 360 illumination, whereas LED's a not as bright and are much more focussed..
prolly not much help but 
oh, 20,000mcd LED's are pretty bright 
you can also get bright 10mm LED's (i'm getting some red, orange and yellow ones soon) which may spread the light more... will see..
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Location:
Brisbane
Registered:
February 2003
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 07:42
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and... a LED requires some form of current limiter (e.g. a resistor) as it's not a 'resistive' device like a light bulb (which is really a light-weight resistor in a vacuum). If you wire a LED between v+ and eath, you make a short and the LED has extremely short life, a resistor between the LED and v+ will prevent this. LEDs are also a diode, current has to come from correct direction to flow thru and light up.
jaycar are selling some light-bulb replacement things using LEDs - probably a bit pricey if you can make small PCBs but for the non-geeky, non-soldering-iron-savvy they might be what you're after - tho for the mini lights in your dashboard, you might have to make it all yourself.
there are some super-bright LEDs on jaycar's web site <www.jaycar.com.au>
charles.
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Location:
Sydney
Registered:
November 2003
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 07:59
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has anyone tried roughing the lense on an LED so it diffuses more light?..
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Location:
Wollongong
Registered:
May 2002
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 10:13
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Yeah, tried it once... it does make it better, but still not like a globe. It's still semi-directional even if you roughen the whole thing.
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Location:
Perth
Registered:
June 2002
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 10:20
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When I did mine, instead of resistors I made a little voltage regulation circuit which incorporated current limiting and I also fitted a dimmer.
Bugger all parts needed. If anyone wants a list of components and a circuit diagram let me know.
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Location:
Melbourne
Registered:
May 2002
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 11:44
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you really need to open up the cluster and get silver paint inside so the light ends up out on the dials or use lots of leds 
Allan
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 12:01
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One other thing to remember is that LED's of different colours will have a different brightness even though their MCD rating may be the same. This is because a lot of the light emitted by an LED may be out of the visible range. The best example is to compare a 20,000MCD red LED against a 5000MCD blue LED... The blue LED appears brighter than the red because a lot of the light from the red LED is out of the visible range (e.g. Infra Red)
If you are able to obtain the lumens (or ANSI lumems [Al]) value of the LED's you are looking for you will find that you can compare brightnesses of different coloured LED's more effectively.
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 13:00
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a friend of mine is developing direct replacements for the wegde bulbs used in instrament lights, i have a prototype set and they work PERFECTTLY, much better than those stupid condom bulb cover things.
i am using red LEDs to match my head unit display, let me know if you want a set!
here is a photo of his cluster,
red and amber are available, white and blue are possible but very expensive
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 14:07
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true different colours appear different brightness, but also has to do with the 'angle of viewing' etc.
LED's are monochromatic, so usually ONLY have light emitted in the visible spectrum.
incandesecnts give off full range of light (infrared, heat etc) as mentioned in the tech article on the site i posted above.
as they also mention, LED's are rated by 'on axis' measurements which are in candelas, whereas incandescents are measured in Lumens, which is a 360 degree measurement... an LED rating in Lumens will not reflect the actual viewing brightness, particularly if it has a small viewing angle
SBS, they look SHIIIIINY!!!!!!
heh heh, i had to put foil in my KE15's cluster to get ANY light coming to the dials
Cya, Stewart
| Toobs wrote on Sun, 14 December 2003 23:01 |
One other thing to remember is that LED's of different colours will have a different brightness even though their MCD rating may be the same. This is because a lot of the light emitted by an LED may be out of the visible range. The best example is to compare a 20,000MCD red LED against a 5000MCD blue LED... The blue LED appears brighter than the red because a lot of the light from the red LED is out of the visible range (e.g. Infra Red)
If you are able to obtain the lumens (or ANSI lumems [Al]) value of the LED's you are looking for you will find that you can compare brightnesses of different coloured LED's more effectively.
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: how many MCD for leds to replace dash globes.
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Sun, 14 December 2003 22:09
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well these require no foil or anything, the light dispersion is almost as great as a bulb (except it only casts light forwards if you know what i mean) these led bulb replacements use SMD LEDs, they have an extremely wide viewing angle, close to 180 degrees.
ages ago i was going to use normal LEDs, and it would have taken heaps of them, as they have such a narrow viewing angle,
grinding the plastic off the tip does virtually nothing to scatter the light more.
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: how many MCD for leds to replace dash globes.
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Mon, 15 December 2003 02:38
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| Toobs wrote on Sun, 14 December 2003 22:31 |
One other thing to remember is that LED's of different colours will have a different brightness even though their MCD rating may be the same. This is because a lot of the light emitted by an LED may be out of the visible range. The best example is to compare a 20,000MCD red LED against a 5000MCD blue LED... The blue LED appears brighter than the red because a lot of the light from the red LED is out of the visible range (e.g. Infra Red)
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This is incorrect.
LEDs are monochromatic (sp?), which means that it only produces one wavelength (shade) of light.
Some colors look brighter than others because our eyes dont see all shades of light at the same level.
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Location:
Sydney
Registered:
November 2003
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Re: how many MCD for leds to replace dash globes.
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Mon, 15 December 2003 06:06
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blue appear brighter because it has some white in it...
pure red light will not destroy your night vision by giving an after-image (when u stare at a white light then cant see shit for a minute, [this is alos why clock radios are mostly red])
so red is alot softer on the eyes and doesnt make u flinch, maybe thats why blue appears brighter...
just my 2c
also SMDs is a good idea, due to the viewing angle... now if only i could locate some of those insanely bright phone ones...
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: how many MCD for leds to replace dash globes.
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Mon, 15 December 2003 10:02
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dude thats a great idea.
just buy some shitty old 5110's and desolder the leds off the board!
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Location:
Sydney
Registered:
November 2003
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Re: how many MCD for leds to replace dash globes.
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Mon, 15 December 2003 11:20
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except shittty-one-tens are green and my cluster is already green....
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: how many MCD for leds to replace dash globes.
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Mon, 15 December 2003 19:11
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dude, shitty green is what i'm after
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