Re: Anyone moved to LED Lighting?

[don@xxxxxxxxxxxxxx (Don Klipstein)]

In article <gaCOm.35052$We2.18874@xxxxxxxxxxxx>, Josepi wrote:
>The traffic light people cannot afford failures. The legal implications are
>too great. I am not sure if it is based on manufactures warraties,
>recommendations or history but we still ocasional segments missing.
>
>With LED experience this may also be a heat problem with retrofitting old
>units and heat not being drawn away?? When you push LEDs too hard they don't
>last long. This is only from a small sample area with slightly over $500K
>population.

  I meant being kept in service for 5-10 years.  Most of Philadelphia's
red ones installed in the 1990's and using an LED chemistry since
superseded in traffic signal use are still working and in service, not
relaced just for a few LEDs being out.

  Now that they are making them with power consumption as low as 7 watts
for ones 8 inches in diameter and 8 watts for the ones 12 inches in
diameter, heat is not that big a deal in traffic signals that had
incandescents of 92 or 116 watts.  Such huge reduction in power
consumption occurs in part from not having 70-75% of the light blocked
by red and green filters.

  If any failure is so intolerable, then why were incandescents
acceptable?

 - Don Klipstein (don@xxxxxxxxx)

>"Don Klipstein" <don@xxxxxxxxxxxxxx> wrote in message
>news:slrnhglqb4.6b4.don@xxxxxxxxxxxxxxxxx
>>  I have plenty of experience where I have been able to track individual
>> units due to fading and/or a few LEDs being burned out and/or LEDs of a
>> particular spectral characteristic are obsolete for the purpose due to
>> lower efficiency than more modern ones.  I can tell you that LED traffic
>> signal units have a very high rate of lasting a lot more than 2 years -
>> more like 5-10.
>>
>> - Don Klipstein (don@xxxxxxxxx)
>
>> In article <VCBOm.52114$de6.17133@xxxxxxxxxxxx>, Josepi wrote in part:
>>
>>>BTW: LEDs in traffic control lights are typically replaced every two
>>>years.
>>>The individual units continually burn out with the severe heat and current
>>>demand on them.