On May 19, 2:38*pm, wrote:
On Thu, 19 May 2011 08:41:59 -0400, Hairy Kraut wrote:
In article ,
says...

On Wed, 18 May 2011 14:07:45 -0400, Harryk
wrote:

Canuck57 wrote:
On 17/05/2011 8:27 PM, wrote:
On Tue, 17 May 2011 21:41:50 -0400, Wayne B
wrote:

On Tue, 17 May 2011 14:09:47 -0400, I_am_Tosk
wrote:

F*ck you Al Gore you hypocritical piece of ****...

Scott, with all due respect, energy efficiency is something we should
all be interested in. It turns out that high efficiency bulbs,
especially LEDs, are a good long term investment. Yes, they cost
more, and yes, they still have a few rough edges, but over the useful
life of the bulb the cost per hour is a lot lower. That should be of
interest to anyone who is thrifty. Costs will drop as volume builds
and the technology improves. It's already happening.

That is only true if you actually get the expected life out of them. I
am still waiting. Most LEDs in light bulbs are driven at such high
currents that I do not see them lasting as long as the prediction.

I am not having wonderful experiences with CFLs and I went for them
big time. I seem to be having early end of life at something like
10-15 % based on 20 - 30 lamps. I have had at least 5 bad ones.

No I didn't call EPA when I threw them away. I did break one (not in
the 5) and I cleaned it up with a big wad of wet paper towel.
I threw everything in the trash

I find the batches and brands of CFLs have different lifetimes. Some
lots, they last only a year maybe two. But have some now 7 years old.
Seems to vary quit a bit in the quality and longevity.

I bought some CFL floodlight bulbs for a trio of recessed ceiling
fixtures. They seem to be working out ok...low wattage, brighter than
the incandescent bulbs they replaced, seemingly cooler, whiter white.

I had a couple of those in my motion lights and they both died an
early death. My electrical folks say it is because the ballast is
above the reflector so the heat does not get radiated out of the bell.
They say they are having the same trouble with "R" style CFLs in
recessed cans.

BTW one thing I notice with the LEDs I have is (the decora night light
thing) that they "strobe" when you have motion across them. It is 60hz
so you don't notice it most of the time but if you are walking past
one you definitely get the 80s disco thing going on.

Any light strobes at 60Hz because that's the way our A.C. current works!

The difference is how fast the lamp responds to that change. A
tungsten filament has a large amount of latency and you can select
phosphors in a fluorescent to mitigate the effect but a LED is
instant. If you rectified and filtered the AC you could eliminate the
problem. I am curious about how long these LEDs will last since my
line voltage is on the high side of nominal at 124V. They drive them
pretty hard.

See my post elsewhere in this thread... the LED's aren't being driven
by a simple half or full wave rectifier, they are being driven by a
chip that regulates their drive signal. That's why these AC bulbs are
so expensive... they aren't just a string of LEDs, they also have a
heat sink and drive circuitry to control them.