I notice in all the stores around me that a 150 watt bulb costs as much
as 4 100 watt bulbs. The cost of manufacturing the 150 cannot be that
much more than a 100 watt. Must be the cardboard package that makes the
difference. Mr. Bell is probably turning in his grave over this
lower sales volume would directly translate into lower price. However,
if this discourages other manufacturers from entering the 150w bulb
market, then the price would go back up.
Bulbs currently are way overpriced and hardly last past 6 months where I
"Then said I, Wisdom [is] better than strength: nevertheless the poor
Keep in mind where most of the cost of obtaining and operating an
incandescent lightbulb is - the electricity to operate it!
Suppose you get a 75 watt incandescent costing $1.50 at a convenience
store (as opposed to less per 4-pack at Lowes) and designed to last 750
hours and producing 1210 lumens, and a 100 watt one with the filament
being operated less aggressively operated so as to produce the same amount
of light - at which point it would have life expectancy in the 10,000's of
hours. For the sake of argument, suppose the 100 watt lightbulb with same
light output as the 750 hour $1.25 lightbulb lasted forever and was given
away for free! (As opposed to 100 watt dollar store, Sunbeam and
Polaraoid lightbulbs costing $1 per 3-pack, producing less light than a
usual 750 hour 75W lightbulb and with rated life expectancy of 1000 or
Cost over 750 hours:
75 watt 750 hour lightbulb hypothetical free 100 watt forever-bulb
Lightbulb $1.50 Nothing
(13-30 cents if
you shop around)
10 cents per KWH) $56.25 $75.00
Bottom line $56.38-$57.75 plus $75.00
labor of replacing bulb
Any idea now why lightbulbs often have filaments run so aggressively
hot? A few decades ago there were even congressional hearings into
Any idea now why compact fluorescents are a better deal, even if you
have a situation wheree you need 1 wattage up to get the light you want
even if they last only half as long as they do under standardized
- Don Klipstein ( firstname.lastname@example.org)
with a calculation error to correct:
I did find need to correct myself! Go down about a page or two to see
figures that I screwed up and my corrections - with life extension of
incandescents remaining a losing proposition! 2 lines a page or two down
have numbers I need to fix by a factor of 10 - but should one need to
stick with incandescents, ones 60 watts or more are most economical with
filament design to run aggressively hot to the point of shortening life to
the 750-1,000 hour range!
CORRECT FIGURES: $5.62 $7.50
CORRECT TO: $5.75-$7.13 plus $7.50
bulb change labor
Good catch, I was about to respond then looked to
see if you found the error.
Your point is certainly valid, electricity not
bulb cost is the main factor. I have no idea
what the operating life time of most ight bulbs in
my house is, but it is highly variable.
I have a good idea of the operating hours of my 60
watt desk lamp which is close to 2,000 hours a
year. Bulbs burn out somewhat more frequently
than once per year. Thus bulb life is probably in
the 1500 hour area. Even bathroom lights (four 60
watt bulbs) have to have an average life of well
over 750 hours based on burn out replacement and
an average on time of 2 hours perday.
I recently installed two led nightlights (cycles
through 6 colors) and calculated the annual cost
based on the wattage and local power costs.
Assuming the light remains on 24 hours a day, the
cost would be 32 cents per year. Wonder what the
operating life will really be. Fairly long, I
hope, since each light was $3.00 (in a pack of 5).
Nope - Edison was the first to make a market viable light bulb and patent
it. Edison actually followed several other inventors of light bulbs.
Edison's contribution was a longer lasting version, an improvement on what
was available at the time. See
On Thu, 06 Apr 2006 22:10:56 GMT, "George E. Cawthon"
Edison invented the Courtship of Eddie's Father.
See the PBS doc, for info about the problems between Wright and
Curtis. Apparently Curtis had connections and it took the Wrights
decades to get their fair acknowledgement. Sort of a shame that they
named an air force base, Curtis-Wright.
Right you are. Wrong inventor, but the idea is the same. I realize that
are more popular, but that's still no justification for the price
differential. By the way,
that is a one way bulb. Three ways are just as expensive, but there I can
see a difference in technology that might warrent a price increase.
When I asked at my local grocery one day why it was [much] cheaper to
buy 2 32oz mayos than it was to buy one 64oz the manager explained
that it is all computerized & the computer calculates how long
something sits on the shelf when it determines the markup.
'Look at it like the product is paying rent for shelf space' he said.
The markup is much lower on items that turn over rapidly. [like 1 qt
mayo, and 100watt lightbulbs]
In some cases as it goes unchecked it gets rediculous. The 32oz
mayo almost got to the same price as the 64 as fewer and fewer prople
bought the overpriced 64oz.
Mayo lasts a long time.
But I have to ask myself, should I buy a gallon of milk at a time or a
half gallon? IIRC, if I drink 80% of the gallon before the milk
spoils**, I won't have wasted money, but if I have to throw away the
rest, I have wasted milk.
**Normally I can drink a gallon before it spoils, but if my tastes
change for a week, for example, I may not.
BTW, milk is good much longer than it smells good in the plastic
bottle. When the milk is more than a week old, say, I sniff the
bottle and it sometimes smells sour. But if it isn't two weeks old,
almost always when I pour myself a glass, it smells and tastes
perfect. It must be that there is a light coat of milk on the inside
of the bottle or carton, that spoils early, because it is exposed to
the air all that time.
Also, on occasion, I've left a bottle out all night. That's not
enough to ruin milk these days***, and one still has a day or two to
drink what is left in the bottle. My experience is that gallon
bottles last longer than half gallons when left out, because it takes
longer to warm maybe.
***More consistent refrigeration. Good stores don't leave the milk on
the loading dock for hours like used to be the case a lot, and still
is some places. They get it out of the refrigerated truck and into
their own refrigerator before it warms up, and there is probably
better care at the dairy too. Milk can last 3 weeks in your
refrigerator. Time before the bottle is opened counts as half, sort
of like spaghetti sauce. Spaghetti sauce lasts in the jar much longer
if one opens the lid and quickly pours out the sauce, before many mold
spores can fall into the jar.
Why not buy a 150watt output screw in florescent and forget about buying
another bulb for this lamp for up to 10 years? It takes MUCH less power
to operate, generates MUCH less heat, and only costs less than twice
the price of the 150W bulb (seeing them now for under $10 including
those that rival incandescent lamps for pleasant color - 5000 Kelvin
color temp) Lifetimes on compact florescent bulbs are ranging,
depending on brand from 7,000 operating hours to as much as 15,000
BTW compact screw ins are available up to 150W input, 650W light
output. The closer the bulb gets to 6500 Kelvin color temp, the happier
you will be with this long term. 6500 Kelvin is very very close to
pure, stark white (overhead sun on cloudless, pollution free day)
Local stores carry a good selection, but for the broadest range of
choices, do a Google search for light bulbs. I picked www.1000bulbs.com
to do my research. They are located in Mesquite Texas, so pretty
central to most areas of the USA. 60W equivalent bulbs are available
there for just over $2 each.
Caution about flourescent bulbs. Most fluorescent bulbs are not
(Most of the light switches in my house are dimmers.) Even
the ones that are
dimmable often make a very annoying buzz when they
are turned down low. I
suggest you try a single bulb before committing
to filling your house with them.
I haven't checked prices here (in Calif.) but I once was buying
Sears that was priced incorrectly (too low). They gave me
the low price because
it was their mistake. Check that the 150watt
pricing wasn't a clerical error.
If it isn't - it may be priced high
to dissuade people from using the more
Robert Gammon Wrote:
> sherwindu wrote:
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