On Dec 1, 1:26 am, Kris Tilford <[EMAIL PROTECTED]> wrote:
> Newer LCDs are now lit with LEDs that last almost forever, so this
> shouldn't be an issue in the future,
Don't believe all the hype about LED lighting. It's getting there,
but it isn't there yet.
If you read the datasheets for the high intensity (HI) LEDs on the
manufacturer's sites you will find that they predict a 50,000 hour
lifetime to 70% brightness. A good fluorescent tube has a
*specified* lifetime of 30,000 hours to 80% brightness.
The manufacturers give no information on whether that decay to 70%
brightness is linear, front-loaded or rear-loaded. So they last a
long time, but not forever.
The HI LEDs currently on the market are barely as energy efficient as
good high intensity fluorescents, although they may be better than the
tubes used in LCD displays. Compared to HO T5 fluorescent room/
aquarium/greenhouse lighting they are still behind.
The equipment cost for the latest HI LEDs is 15 - 20 times as high per
available light intensity as fluorescent, although, again, the
comparison may be different in applications specific to LCD panels
where 12V supply may already be available and so represent a cost
savings over providing a ballast equivalent for fluorescent tubes.
However, the LED cost for 5000 lumens of light is about $300 - $400
where the fluorescent tube cost is about $20, that's ignoring power
supplies.
There are some better LEDs in the labs which haven't made it into mass
production yet, and the technology is improving quickly. But it is
not better than fluorescent.
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