[ale] OT CFL cleanup / LED light bulbs starting to become affordable

[Ron Frazier (ALE)]

Not trying to be controversial, but, Home Depot here in Cumming currently has an (or is it a) LED bulb on display connected to a Lutron dimmer.  You can dim the thing all the way down to 10-20% of full.  It's not quite as good as an incandescent, but close.  It was pretty cool.  It may be that this technology is very new and was not available in the recent past.

Also, when I was teaching electronics at DeVry, I had my students build an LED dimming circuit based feeding the LED a train of pulses of DC energy and controlling the pulse width.  Do that fast enough, and change the duty cycle of the pulses, and you can get the optical effect of dimming the LED almost down to nothing at all.  When the LED was on, it was fully on, but the optical effect at a low duty cycle appeared to be a dim bulb.  Whether anyone is using that technique, I have no idea.

Sincerely,

Ron


Adrya Stembridge <adrya.stembridge at gmail.com> wrote:

>Depends on how you define "work".   LEDs do not have the same range of
>brightness that incandescent or halogen bulbs have, so the dimming
>effect
>is negligible.
>
>
>On Wed, Jul 3, 2013 at 2:17 PM, Ron Frazier (ALE) <
>atllinuxenthinfo at techstarship.com> wrote:
>
>> Many of the new LED's are dimmable.  Some require a special dimmer. 
>The
>> CREE's are dimmable with conventional dimmers, so says the package at
>least.
>>
>> Ron
>>
>>
>> JD <jdp at algoloma.com> wrote:
>>
>> >
>> >All the new-lights have failed to support dimmers.  Without that
>> >support, I'm on
>> >the old-style incandescent lights forever.
>> >
>> >I have tried CFD and LED.
>> >
>> >LED are fantastic for torches. Love them.
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--

Sent from my Android Acer A500 tablet with bluetooth keyboard and K-9 Mail.
Please excuse my potential brevity if I'm typing on the touch screen.

(PS - If you email me and don't get a quick response, you might want to
call on the phone.  I get about 300 emails per day from alternate energy
mailing lists and such.  I don't always see new email messages very quickly.)

Ron Frazier
770-205-9422 (O)   Leave a message.
linuxdude AT techstarship.com
Litecoin: LZzAJu9rZEWzALxDhAHnWLRvybVAVgwTh3
Bitcoin: 15s3aLVsxm8EuQvT8gUDw3RWqvuY9hPGUU