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Posted by ransley on April 29, 2008, 3:11 am
On Apr 28, 11:49=A0pm, d...@manx.misty.com (Don Klipstein) wrote:
> >sa...@dog.com wrote:
>
> >> On Mon, 28 Apr 2008 15:00:45 GMT, Wayne Boatwright
>
> >>>On Mon 28 Apr 2008 06:44:08a, =A0told us...
>
> >>>>Subject: Re: Dimmable CFL
> >>>>From: trad...@optonline.net
>
e:
>
m
> >>>>>(Don Klipstein) wrote:
>
> >>>>>>I give low odds of its energy efficiency exceeding that of a 230 vol=
t
> >>>>>>incandescent being powered by 120 volts
>
> >>>>>Do you believe that 130V-rated (commercial?) incandescent lamps,
> >>>>>operating at ~120VAC, are longer-lasting enough to be worth the hassl=
e
> >>>>>of getting them (wholesaler) and price, compared to an everyday bulb?=
>
> >>>Yes, I believe that, and almost all the incandescent bulbs I have in my=
> >>>home are 130v-rated. =A0Their logevity is astounding.
>
> >> They use more electricity, however.
>
> >Hmmm,
> >I don't think so. 130V rated lamp is on 120V circuit.
> >Simple Ohm's law.
>
> =A0 A 130V incandescent being operated at 120 volts consumes about 89%,
> maybe 88% of rated power. =A0(Not 85% - the filament's resistance varies
> directly with temperature.)
>
> =A0 And when a 130V incandescent is operated at 120 volts, it produces
> about 75-76% of its full light output. =A0Efficiency decreases a lot when
> an incandescent is underpowered.
>
> =A0 A 130V 100W incandescent only outshines a 75W 120V one due to
> incandescents having "economies of scale" that reduce the efficiency of
> lower wattage and lower current ones. =A0A 75W 120V incandescent produces
> about 69% of the light of a 100W one.
>
> =A0 One more note: =A0If you have incandescents on a dimmer and usually
> operate them dimmed, consider using a lower wattage to use less dimming.
> Although a 75W incandescent produces 69% of the light of a 100 watt one,
> a 100 watt one dimmed to consume 75 watts has about 53% of its full
> output.
>
> =A0 That leads to another consideration: =A0Reduce the number of bulbs if
> you can - a smaller number of higher wattage bulbs will be slightly
> more efficient than a larger number of lower wattage ones. =A0Just don't
> take this to an extreme that affects evenness of illumination.
>
> =A0- Don Klipstein (d...@misty.com)- Hide quoted text -
>
> - Show quoted text -
To the point, a new "energy efficient" incandesant is BS ,
incandesants must be taxed to force savings upon us in the form of
energy.
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