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luminous
What units did the tags use?
Are you certain it was lamp cost saving and not electricity?
there are two competing factors in incandescent lamps, life and
efficiency. Halogen cycle lamps may be operated at the temperature ofTemp.
std. gas filled lamps, and, thereby, have a considerably longer life.
From an old table (< '68 ca.) two comparable lamps:
Both std. and Iodine cycle (quartzline) 500 W operated at a color
of 3200. They both emit ~ 10K Lumens; the iodine has a life of 2,000light
hr.., the std (CZX projection) only 25 hr..
more info. including a reflection coating that much increases the
efficiency:
http://www.lampcenter.com/halog_2en.htm
bc whose home is almost completely fluorescently lighted
John Clement wrote:
That may be true, but the tag actually implied you were saving
electricity. It did not have any information about lifetime or bulb
cost. It looked so impressive until you read the actual information.
What surprised me is that 60W halogen bulbs have comparable rated
store.output to 60W regular bulbs the last time I looked at them in the
toThey usually have some claims about being "more efficient". Perhaps
they put out more light in the more visible portion of the spectrum
morevalidate the claim of higher efficiency?
Things have not changed since they sold in radio ads genuine 14 carat
simulated gold rings.
John M. Clement
Houston, TX
-----Original Message-----Behalf
From: Forum for Physics Educators [mailto:PHYS-L@lists.nau.edu] On
Of Tim Folkerts
Sent: Saturday, June 21, 2003 3:32 PM
To: PHYS-L@lists.nau.edu
Subject: Re: Season misconceptions in newspaper
I have an interesting tag that I stole from a lamp in a store. It
claims that an expensive lamp which uses a 60 W halogen bulb is
comparedefficient and saves money over a conventional 60 W bulb. I
longer,the
theyrated lumens and wattage with a conventional light bulb and found
were comparable. Hmmm I have asked students whether the claim wasOf course, if the halogen bulb costs 3x as much, but lasts 10x
true.
thendo
it DOES save money!
Timothy Folkerts
"The only thing necessary for the triumph of evil is for good men to
nothing." - Edmund Burke