Re: Anyone moved to LED Lighting?

[don@xxxxxxxxxxxxxx (Don Klipstein)]

In article <aNBOm.39295$X01.30413@xxxxxxxxxxxx>, Josepi wrote:
>Because, overall **white** LEDs do not put out much more, if any, light
>than an incandescent bulb for the energy used!
>
>LEDs are more efficient in their usage than incandescents, can be. They are
>directional, focusing all their output in one direction. The only produce
>one colour of light, efficiently and do it well. An incandescent bulb with a
>filter only wastes energy from heat, losing all the other colours. LED's are
>also quite small with intense output, making them more esily seen to the
>human eye (noticable). When it comes to flood illumination white LEDs are
>too costly to compete for the small increase, if any, efficiency.

  Cost is an obstacle, but plenty of available white LEDs are now a lot
more efficient than incandescents.  Efficiency like that of CFLs is now
the cutting edge for available warm white ones, and cool white ones
without high color rendering index now get as efficient as T8
fluorescents.

  Osram recently put an 8 watt LED bulb on the market in Europe, with as
much lumen output as an 8 watt CFL.

 - Don Klipstein (don@xxxxxxxxx)

>"Don Klipstein" <don@xxxxxxxxxxxxxx> wrote in message
>news:slrnhgk13s.dcf.don@xxxxxxxxxxxxxxxxx
>> In article <he7b0502e2r@xxxxxxxxxxxxxxxxx>, Nate Nagel wrote:
>>
>>>What I don't understand is why LEDs are so excellent in flashlights (the
>>>3W Task Force light kicks a Mag-Lite's ass BTW) bike head/taillights,
>>>truck taillights and traffic lights but it is so difficult to find good
>>>ones for home lighting and/or retrofitting into car taillights?
>>
>>  Flashlight bulbs tend to mostly be less efficient than ones used for
>> home lighting.
>>
>>  One advantage LEDs have for flashlights is that their energy energy only
>> changes slightly (mostly improves slightly) when the batteries weaken,
>> while incandescents greatly lose energy efficiency.
>>
>>  Another thing:  The cost of LEDs needed to achieve an 800, 1600 or 1710
>> lumen light is fairly prohibitive, more so for warm white, and the amount
>> of heatsinking needed is a tall order now to get into something the size
>> of a regular lightbulb.
>>
>>  As for LED taillights:  They make those.  Cadillac has been using them
>> for many years already.  Some other cars are now being made with them.
>>
>>  An LED retrofit bulb to put into a taillight made for an incandescent is
>> another story.  It is quite a tall order to get an LED light source with
>> the same emitter shape and size and same radiation pattern and suitable
>> output so as to achieve the same optical results as with incandescent.
>>
>>  A light to serve a legally required function on a motor vehicle has to
>> fall within both lower and upper limits of candela into a few dozen
>> different specified directions, and must be properly certified to do so,
>> in order to be street legal.  An incandescent light with an LED retrofit
>> bulb generally fails to achieve this, let alone be certified to do so with
>> any particular mfr/part-number LED bulb.  It is illegal to refit a legally
>> required motor vehicle light with a bulb other than one it is certified to
>> use.
>>
>> - Don Klipstein (don@xxxxxxxxx)
>
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