Re: The insane progress nobody is talking about

On Sat, 22 Jun 2024 16:40:02 -0500, Lynn McGuire
<lynnmcguire5@gmail.com> wrote:

On 6/22/2024 3:47 PM, Scott Dorsey wrote:

Paul S Person  <psperson@old.netcom.invalid> wrote:

Perhaps there are can fixtures designed to use LEDs.

 
There are commercial can fixtures with integral LEDs which most of the
big office building guys are using now instead of conventional can fixtures
with lamps screwed into them.  I worry about them since they are not as
easily replaced as a light bulb, but I have no personal experience with them.
--scott

>
I have six of them at the house.  One died recently, probably 20+ years old.

Well, maybe. This suggests otherwise:

"Experimental white LEDs were demonstrated in 2014 to produce 303
lumens per watt of electricity (lm/W); some can last up to 100,000
hours." [20 yrs == 2034]

Then again,

"With the development of high-efficiency and high-power LEDs, it has
become possible to use LEDs in lighting and illumination. To encourage
the shift to LED lamps and other high-efficiency lighting, in 2008 the
US Department of Energy created the L Prize competition. The Philips
Lighting North America LED bulb won the first competition on August 3,
2011, after successfully completing 18 months of intensive field, lab,
and product testing." [20 yrs == 2031]

This is all from <https://en.wikipedia.org/wiki/Light-emitting_diode>,
which is what Bing produced for "led can lights wiki". Note that no
info on when led can lights first appeared was found. LEDs were around
earlier, but were mostly used in indicator lights (particularly red
indicator lights) and calculator displays (also red, and often with a
magnifying strip over them to make the numbers readable).

Note that I am not doubting that they work and last longer than
incandescents. But 20+ years seems a bit ... extreme.

Mine, purchase in Oct 2020, are more credible: the actual description
of the bulbs claims 7 years at 3hr/day. This is, of course, 7665
hours, ignoring leap years. Of course, mine are in use for a lot
longer than a measly 3 hours each day.

But that's not a problem. More problematic is that a general chart
above the actual claim shows LEDs lasting 10-22 years at 3hr/day. And
it shows CFLs lasting 7-9 years at 3hr/day.

IOW, it says that the LEDs I bought can be expected to last as long as
an LED that makes it to the lowest part of its range. Still, what can
you expect from bulbs that cost less than $2 each?

This, BTW, is the sort of nonsense that positively /screams/
"marketing bumpf -- do not take seriously".
--
"Here lies the Tuscan poet Aretino,
Who evil spoke of everyone but God,
Giving as his excuse, 'I never knew him.'"