Don't you mean we should use RED LEDs?
Now all we need is for someone to manufacture a crystal-clear taillight lens
for MGBs...
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 9/17/06 5:57 AM, Desmond Mullen at dkmullen@email.unc.edu wrote:
> Roger,
>
> I think I read that if you use white LEDs in an application that has a red
> lens (like an MGB tail light) then the red lens will cancel out all but the
> red wavelengths coming from the LED (which won't be that much on a white
> LED). They recommend that you use red LEDs with red lenses.
>
> I did a search and found a number of references. One interesting article is
> at:
> http://www.hendonpub.com/publications/lawandorder/otherarticles.asp?ID=729
>
> "According to Mike Walma, electronics/optics engineer, the LED white light
> is a combination of all wavelengths of light. The red lens acts as a filter,
> blocking all wavelengths except red. This makes the use of a white LED
> behind a red lens very inefficient, with output losses around 50% and up.
> LEDs are very efficient at producing one color (wavelength) of light. LEDs
> producing the full spectrum of white light are not as efficient, and the
> light output not passed through the lens is converted to heat."
>
> So, it sounds like we've got to use white LEDs.
>
> -Desmond
> '78 MGB
>
>
>
> On 9/16/06 12:00 AM, "Roger Wilt" <rdwilt@pol.net> wrote:
>> I agree with idea of brighter brake lights for safety so I ordered and
>> received a pair of replacement bulbs for my MGB 1157's -Matrix II 32 LEDs
>> from autoillumination.com and they are putting out less than 1/2 the wattage
>> than my old 1157. Dangerously dim. I'm probably sending them back.unless
>> someone has a great idea of what's up -remember the old 1157's are working
>> fine. I checked, cleaned contact points etc.
>> Roger
>> '51MGTD
>> '74MGB
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