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Which uses more electricity, a 75 watt light bulb or a 150 with a dimmer so that it is as bright as the 75?

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Which uses more electricity, a 75 watt light bulb or a 150 with a dimmer so that it is as bright as the 75? mm 05-19-2006
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Posted by CJT on May 20, 2006, 2:50 am
Tony Hwang wrote:

> mm wrote:
>
>> Which uses more electricity, a 75 watt light bulb, or a 150 with a
>> dimmer so that it is only as bright as the 75?
>>
>> If one uses more, does it use much more?
>
> Hi,
> As bright means almost same not equal. So the question is moot.
> For same kind bulbs takes same amount of energy to produce same
> Lumen(brightness)

No, the balance between heat and light changes.

--
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Posted by on May 20, 2006, 7:58 am

CJT wrote:
> Tony Hwang wrote:
>
> > mm wrote:
> >
> >> Which uses more electricity, a 75 watt light bulb, or a 150 with a
> >> dimmer so that it is only as bright as the 75?
> >>
> >> If one uses more, does it use much more?
> >
> > Hi,
> > As bright means almost same not equal. So the question is moot.
> > For same kind bulbs takes same amount of energy to produce same
> > Lumen(brightness)
>
> No, the balance between heat and light changes.
>
>


I'd also say that the meaning of "as bright" is that the two would be
equal brightness, not "almost same." Particularly in context, the
question was clear.


Posted by Joseph Meehan on May 20, 2006, 9:04 am
mm wrote:
> Which uses more electricity, a 75 watt light bulb, or a 150 with a
> dimmer so that it is only as bright as the 75?
>
> If one uses more, does it use much more?

No matter how you dim it, the 75 will be more efficient or brighter if
you like. However the 150 watt will last a lot longer.

The hotter the lamp burns the more efficient it will be and the shorter
its life will be.

--
Joseph Meehan

Dia duit



Posted by hallerb@aol.com on May 20, 2006, 9:25 am
a lamp dimmed to half its wattage will last so long its filament
wouldnt burn out but outgass or redeposit on the inside of the glass
bulb making the bulb very dim even if run at full voltage undimmed.

much of this can be elminated by using compact fluroscents, much more
feeicent with less heat and long life.

most shouldnt be used on dimmers


Posted by mm on May 20, 2006, 4:29 pm
Thanks to everyone who answered. I'll use all this info when deciding
what to put in my three locations with dimmers. The 150's really are
expensive, too, like that guy brought up a few weeks ago. Very
annoying when I knocked the lamp off the kitchen table.

wrote:

>Which uses more electricity, a 75 watt light bulb, or a 150 with a
>dimmer so that it is only as bright as the 75?
>
>If one uses more, does it use much more?


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