Re: Does the BF falcon have LED tail-lights??

"Trevor Wilson" <trevor@[EMAIL PROTECTED]
> writes:


>"Athol" <athol_SPIT_SPAM@[EMAIL PROTECTED]
> wrote in message 
>news:1209088115.373965@[EMAIL PROTECTED]
>> In aus.cars Trevor Wilson <trevor@[EMAIL PROTECTED]
> wrote:
>>> "Saab C900 Viggenist" <c900@[EMAIL PROTECTED]
> wrote:
>>
>>>> and there are numerous ways to
>>>> arrange the light output from an array of LED's to make them give the

>>>> same
>>>> or better distribution/spread/whatever compared to using
>>>> grossly-inefficient
>>>> filament lamps.
>>
>>> **That would depend on the incandescnt and the LED. Howeer, if you
want 
>>> REAL
>>> efficiency, dump LEDs and use decent discharge lamps. Those puppies
are
>>> seriously efficient.
>>
>> None of these LED assemblies that replace a conventional globe comply
with
>> the ADRs, ECE (European) or DOT (USA) regulations.  In all cases, the 
>> light
>> source is intended to be a filament, the position of which is carefully
>> defined within the globe relative to the mounting base.
>>
>> The lamp assembly is designed around the defined light source, ie light
>> emanating from a filament within a carefully defined envelope inside
the
>> assembly.  Fit something other than the correct model of globe and the 
>> lamp
>> assembly is assumed to not comply with the relevant regulations unless
the
>> modified assembly (ie fitted with LED assembly = modified) is tested to

>> the
>> standard again.
>>
>> Similarly, placing discharge (HID) bulbs into housings intended for 
>> halogen
>> globes will not comply.  The light source will not be emanating from
the
>> correct position to be correctly focussed by the reflector and lens.

>**None of which I dispute. What I do dispute is the claim that LEDs are 
>automatically far more efficient than incandescents.

In terms of light output against total power consumption, they are streets
ahead. LED's have always been very highly efficient light emitters,
converting almost all of the electrical energy they consume into photons.
Filament lamps, by comparison, are extremely inefficient, with efficiences
well under 50 percent and in most cases, it's no better than 20 to 30
percent. That's why filament lamps produce so much heat.

The issue has been creating LED products that can output enough light to
match filament lamps, but that's got little to do with the differences in
efficiency. It's because LED's are so efficient that creating the
technology
to make them comparable to filament lamps has actually happened. 

Filament lamps have been around for longer than motor vehicles powered by
internal combustion engines have existed, but because they are so cheap to
make (which belies their inefficiency) they've persisted for almost 100
years as the primary source of auxilliary lighting in motor vehicles.

Craig.
-- 
Craig's Saab C900 Page at      | Craig's Classic Saab Workshop - Sydney
.au
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