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Halogen Replacements for Standard (Edison base) bulb

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Posted by j on March 15, 2012, 8:13 pm
 
   I need a fully dimmable light for a kitchen fixture. I like the light
quality and the relative to incandescent energy savings of the Phillips
Eco Advantage bulbs. I'm not thinking well of the lifespan though. You
wouldn't want to work in a work lamp as it can't take a knock. And my
kitchen light, which is generally partially dimmed has burnt out after a
few months.

   I'd like to try another halogen. Others seem to be rated at 1500
hours (like GE Reveal), but I've heard the GE can be noisy when dimmed.

Any experience or suggestions?

   I've given up on the idea of dimmable CFLs, too many quirks with the
rated for dimmable bulbs. And not good life. I do need an even spherical
light (fixture is pendant IKEA), which cuts out the directional LED
types. Not that I know much about their dimming characteristics.

   Jeff

Posted by Vaughn on March 15, 2012, 9:34 pm
 
On 3/15/2012 4:13 PM, j wrote:

You didn't say what size lamp you are looking for.  Home Depot sells a
$0.00 dimable LED bulb that might fit your needs.  Very even light.
"40-watt" size takes 8.6 watts.

http://tinyurl.com/6pkf2gu
I use one of these in a reading lamp with good results.  I now have 2
LED lamps in my house, and am happy with both.

Vaughn


Posted by j on March 15, 2012, 10:56 pm
 On 3/15/2012 5:34 PM, Vaughn wrote:

   That is interesting and affordable. I need about 100W or so as it
needs to get bright enough to cook and prep with. And then I like to
crank it down for mood or  evening light.

I've got mama bear:

http://graciousgood.files.wordpress.com/2011/06/ikea-lights.png

It's about 2' diameter. I think I could put 3 of those inside to give
120W effective.

   Jeff


Posted by Johny B Good on March 15, 2012, 9:50 pm
 wrote:


 Since the interior surface of the envelope has to be maintained above
250 deg C to allow the halogen recycling of the tungsten vapour back
towards the filament to function and thus stop it being deposited on
the envelope, I would say there's a strong element of truth to that
supposition.

 However, under dimmed conditions, the evaporation rate of tungsten
from the filament will be greatly suppressed but the presence of the
halogen may produce undesirable effects under these reduced
temperature conditions.

 It's been a few years since I last looked at the relevant section of
my "Lamps and Lighting" reference book.

 This wiki article: <http://en.wikipedia.org/wiki/Halogen_lamps>
provides more information (but no mention of the 250 deg C figure so
is a little bit hazy on some of the detail.
--
Regards, J B Good

Posted by j on March 15, 2012, 10:32 pm
 On 3/15/2012 5:50 PM, Johny B Good wrote:

gets

   Thanks.

   It appears that I shouldn't dim this too low, and that either iodine
or bromine fields better low temperature results.

  With a reduced voltage the evaporation is lower and there may be too
much halogen, which can lead to abnormal failure. At much lower
voltages, the bulb temperature may be too low to support the halogen
cycle, but by this time the evaporation rate is too low for the bulb to
blacken significantly. There are many situations where halogen lamps are
dimmed successfully. However, lamp life may not be extended as much as
predicted. The life span on dimming depends on lamp construction, the
halogen additive used and whether dimming is normally expected for this
type.

And:

http://www.querycat.com/question/cde023ac540f3ece005ddf3d76291fb8

Halogen bulbs used on a dimmer will last longer if they are set to full
"ON" for two minutes before being turned off this helps the particles
from the filament complete their cycle.

   Jeff

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