500w lamp as Space Heater?
Loren Coe
an overhead "infared" heater, mostly because i have two of these, and
cannot find my 1500w toaster heater.
the 1500w heater is a mixed blessing at best, too hot on the body, but
very nice in the very cold. is my idea of using the Halogen light as
a space heater just goofy?
i have heard that lamps for lighting are only 2-5% effecient, but have
no
clue about this application. does white light have a major infared com-
ponent?
any experience, and what the hey, blind speculation, is welcome.
best regards, and Happy Holidays,
--Loren
brian whatcott
You get as much heating from a 500 watt holgen lamp as from a 500 watt
infra red lamp. It's just you can *see* the visible light - and the filament might
not last as long cos it runs hotter.
Regards
Brian Whatcott Altus OK
In article <385FBFC4...@verio.net>, lc...@verio.net says...
Steve TR
printers use a halogen bulb inside the fuser roller. They generate a mass
amount of heat, which is needed to fuse toner to the paper. My Panasonic
KX-F2900 LED Plain Paper Fax Machine uses a 10" or 11" 500 watt halogen
bulb inside a rubber coated roller...this is the fuser.
But 500 watts is probably just too little wattage to act as a decent
heater, even for a small area. What the heck, you already have the lamps,
so why not try it? You might go blind, but you could be warm! ;-)
--
http://www.wfeca.net/~stevetr
1970's Cadillac Eldorado Convertibles
"I'm Soul Alone And Soul Really Matters To Me."
-Hall & Oats, "Out Of Touch"
---Original Message As Follows---
Loren Coe <lc...@verio.net> wrote in article
<385FBFC4...@verio.net>...
Ted Edwards
Spehro Pefhany wrote:
> > These are something like 11W so we leave one
> > turned on all the time outside.
> Why?
'cause he hasn't heard of the dark sky project - yet.
Ted
Med Bennett
Spehro Pefhany wrote:
>
> SWMBO likes it that way, and the power consumption is low enough not to be
> remotely worth arguing the point.
>
But the point was, it's bad for astronomy! I guess that's the downside of
crossposting - irrelevant to those in the other groups beside astro.
Bob May
sources. This means that if you look at a incadesent lamp's light
curve, you will see a rising power with frequency until you get to
some point where it starts falling off again. Emissive souces are
single (or multiple spikes) frequency sources - lasers are the easiest
to understand - of light and the flourescent bulbs are one example
where the mercury vapor emits an UV light which is converted by
phosphers (the white stuff on the inside of the tube) into various
colors. Thus incadesent bulbs are very strong emitters of infrared
and as you reduce the voltage to the bulb, you notice that the color
of the light turns red until it's just barely glowing. If you were to
look at the spectrum at that point, you will see that the very far
infrared is almost as strong as it was before you reduced the power
but the point where the power of the signal starts dropping has
shifted towards the lower frequency by a large margin. Using a
halogen bulb is pretty much of a waste of the purpose of the bulb as
the halogen effect won't be working at that low of a power output.
--
Bob May
I don't read attachments to posts as they may give me a
virus If I expect an attachment from you I will open it..
You may have a brilliant thought but if you put it into an
attachment I won't read it and thus both you and I lose.
I don't like to say it but unfortunatly, there are those who
insist upon being nasty to the rest of us. Bob May
Alan Rothenbush
>i am wondering about using one of my 500w Halogen work lamps as
>an overhead "infared" heater, mostly because i have two of these, and
>cannot find my 1500w toaster heater.
IIRC, there is pretty serious UV component to halogen lamps. The small
reading variety have been banned in several European countries because
of fears of skin cancer.
I'd just buy an electric heater and be done with it.
Alan
--
Alan Rothenbush | The Spartans do not ask the number of the
Academic Computing Services | enemy, only where they are.
Simon Fraser University |
Burnaby, B.C., Canada | Agix of Sparta
Spehro Pefhany
> IIRC, there is pretty serious UV component to halogen lamps. The small
> reading variety have been banned in several European countries because
> of fears of skin cancer.
Most of the little ones have UV filters already. (The Sylvania/Osram ones)
and even the Taiwan ones say they have UV filters. Don't know about the
big 500W jobs but I'd think the cheap glass would absorb most of the UV.
The inexpensive fixtures and the made-in-China US$0.10 F.O.B. lamps tend
to burn up a lot.
BTW, on a different subject, took apart a dead Osram round fluorescent
bulb (the ones that are about 2 - 3 inches in diameter). There is a whole
electronic ballast in each throw-away bulb with about 30 electronic
components in it. No wonder they cost about USD20 a pop. The actual
fluorescent bulb part is similar to the compact ones with two U-shaped
tubes, the whole thing ceramic cemented into a globe with a diffusing
coating on the inside. These are something like 11W so we leave one
turned on all the time outside.
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Spehro Pefhany "The Journey is the reward"
sp...@interlog.com
Fax:(905) 271-9838 (small micro system devt hw/sw + mfg)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Lou Boyd
> These are something like 11W so we leave one
> turned on all the time outside.
Why?
--
Lou Boyd
Fairborn Observatory
Spehro Pefhany
> > These are something like 11W so we leave one
> > turned on all the time outside.
> Why?
SWMBO likes it that way, and the power consumption is low enough not to be
remotely worth arguing the point.
--
Cl...@snyder.on.ca
>i am wondering about using one of my 500w Halogen work lamps as
>an overhead "infared" heater, mostly because i have two of these, and
>cannot find my 1500w toaster heater.
>
It is not a very good space heater, but it will warm all objects in
it's glare. You will feel as much heat (on your head) as you would
from a larger heater.
Look at the heat lamps installed in bathrooms, the light banks used in
paint ovens, and the lowly chicken brooder.
IIRC about 250 watts.
I used my Halogen work light to speed the drying of a paint repair on
a car door - from 6 feet away it discoloured the paint (appliance
white ended up closer to eggshell) and the door gor MUCH too hot to
touch - in less than an hour in a cold shop.
It heats YOU , not the air.
Robert Hancock
for them to be legal.
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hanc...@nospamhome.com
Home Page: http://members.home.net/hancockr
"Spehro Pefhany" <sp...@interlog.com> wrote in message
news:8_V74.100$CH5....@cac1.rdr.news.psi.ca...
> In rec.crafts.metalworking Alan Rothenbush <be...@sfu.ca> wrote:
>
> > IIRC, there is pretty serious UV component to halogen lamps. The small
> > reading variety have been banned in several European countries because
> > of fears of skin cancer.
>
> Most of the little ones have UV filters already. (The Sylvania/Osram ones)
> and even the Taiwan ones say they have UV filters. Don't know about the
> big 500W jobs but I'd think the cheap glass would absorb most of the UV.
>
> The inexpensive fixtures and the made-in-China US$0.10 F.O.B. lamps tend
> to burn up a lot.
>
> BTW, on a different subject, took apart a dead Osram round fluorescent
> bulb (the ones that are about 2 - 3 inches in diameter). There is a whole
> electronic ballast in each throw-away bulb with about 30 electronic
> components in it. No wonder they cost about USD20 a pop. The actual
> fluorescent bulb part is similar to the compact ones with two U-shaped
> tubes, the whole thing ceramic cemented into a globe with a diffusing
> coating on the inside. These are something like 11W so we leave one
> turned on all the time outside.
>
> --
>
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Ted Edwards
Spehro Pefhany wrote:
> > SWMBO likes it that way, and the power consumption is low enough not to be
> > remotely worth arguing the point.
> crossposting - irrelevant to those in the other groups beside astro.
What about those of us who, while not astronmers, still like to sit out
and study the night sky *not* the neighbours annoying, useless and
excessive outdoor lights?
Ted
Spehro Pefhany
> What about those of us who, while not astronmers, still like to sit out
> and study the night sky *not* the neighbours annoying, useless and
> excessive outdoor lights?
Wait a week and half? ;-)
They were talking about decommissioning the 74" Cassegrain (where have I
heard that name before?) telescope north of Toronto for those reasons, but
they have not done it. I think it's kept as training for the Hawaiian and
Chilean telescopes where time is more valuable.
David Dunlap Obs.: http://ddo.astro.utoronto.ca/
There's not much hope anywhere near a large city.. LA, Chicago etc. are
just huge grids of Sodium Vapor lights from the sky, with the odd Mercury
and halogen thrown in for good measure. Lots of fluorescent lamps shining
out of office building windows too. A lot of us never even see unlit roads
on a regular basis.
During the blackout in '65 there were UFO reports from NYC because many
people were unaccustomed to what the night sky looks like.
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
jerr...@hotmail.com
Lamps are a lot more efficent than you are saying. They were designed
to give off as little heat as possible per watt of energy. This is a
loss of heat and a financial gain for your power company!
Jerry Greenberg
http://www.zoom-one.com
In article <385FBFC4...@verio.net>,
Loren Coe <lc...@verio.net> wrote:
> i am wondering about using one of my 500w Halogen work lamps as
> an overhead "infared" heater, mostly because i have two of these, and
> cannot find my 1500w toaster heater.
>
> the 1500w heater is a mixed blessing at best, too hot on the body, but
> very nice in the very cold. is my idea of using the Halogen light as
> a space heater just goofy?
>
> i have heard that lamps for lighting are only 2-5% effecient, but have
> no
> clue about this application. does white light have a major infared
com-
>
> ponent?
>
> any experience, and what the hey, blind speculation, is welcome.
>
> best regards, and Happy Holidays,
>
> --Loren
>
>
Sent via Deja.com http://www.deja.com/
Before you buy.
David M. Brodbeck
> But the point was, it's bad for astronomy! I guess that's the downside of
> crossposting - irrelevant to those in the other groups beside astro.
--> Good for security, though.
--------------------------------------------------------------------------
David Brodbeck, N8SRE dmbr...@mtu.edu
finger gu...@cyberspace.org for my public key block.
"The god of Static Friction smiled upon me, and the glory of All Season
Radials shown round about me. And I made it back up to the highway."
David M. Brodbeck
> Why not use a proper space heater with a thermostat?
> Lamps are a lot more efficent than you are saying. They were designed
> to give off as little heat as possible per watt of energy. This is a
> loss of heat and a financial gain for your power company!
--> Actually, what I've heard is that the efficiency of incandescent bulbs
doesn't get better than 10%. Most are in the 5% range, I think. So
of the 500 watts you're putting into that bulb, at least 450 are ending
up as heat. (Of course, an electric space heater is very nearly 100%
efficient. That dim red glow is the only energy that's escaping as anything
other than heat. The best gas furnaces, by comparison, are around 85%
efficient IIRC. Of course, gas is much cheaper than electricity.)
brian whatcott
position the thread opened with:
if you can see the light - or you don't see a thing - it all has the same
heating effect from the same number of nickels in the electric power
meter.
Brian W
In article <83s622$3m4$3...@campus3.mtu.edu>, dmbr...@mtu.edu says...
Lou Boyd
>
> In sci.electronics.repair Med Bennett <mben...@indra.com> wrote:
>
> > But the point was, it's bad for astronomy! I guess that's the downside of
> > crossposting - irrelevant to those in the other groups beside astro.
>
> --> Good for security, though.
Yes, for the security of someone hiding outside in the shadows.
Outdoor lights which come on triggered by PIR or microwave detectors can
be an indicator that someone is outside, but "dusk to dawn" lamps are
just a waste of power and cause light polution. Unless outdoor lighting
is very carefully engineered it just provides hiding places and actually
hurts security. Outdoor lights are pushed by power companies since
they are a good source of income.
Bruce Simpson
wrote:
>BTW, on a different subject, took apart a dead Osram round fluorescent
>bulb (the ones that are about 2 - 3 inches in diameter). There is a whole
>electronic ballast in each throw-away bulb with about 30 electronic
>components in it. No wonder they cost about USD20 a pop. The actual
>fluorescent bulb part is similar to the compact ones with two U-shaped
>tubes, the whole thing ceramic cemented into a globe with a diffusing
>coating on the inside. These are something like 11W so we leave one
>turned on all the time outside.
I've about given up on those "energy saver" compact fluros.
They don't seem to last anywhere near as long as is claimed (in
continuous use), the light output never seems as great as the claimed
equivalent incandescent, and I also wonder about the power savings
they claim.
Unless they have a power factor significantly removed from unity then
multiplying the current times the RMS voltage suggests that they
consume about 60% more power than they are rated at -- ie: the 12W
actually draws about 28W.
Also -- the strobing effect has to be considered when you're working
with rapidly spinning tools.
---------------------------------
Don't send email to me, send a Memo.to me
http://memo.to/BruceSimpson
Memo.to, your email firewall, stops junk email dead!
mull...@advinc.com
Lou Boyd <bo...@apt2.sao.arizona.edu> wrote:
> Yes, for the security of someone hiding outside in the shadows.
Actually I have a few photocell operated lamps outside. I like
them because they keep me (and my family members) from tripping
down the stairs. But they are louvered fixtures that shine down
where your feet go. And I confess to one 75 watt outdoor
flood to illuminate my garage entrance.
But being in the city this is overwhelmed by the thousands of
watts of city streetlights.
And I did take down the four 500 watt each halogen floodlights
aimed at the neighbor's house across the street. Also photocell
operated. The family who rented there finally moved - they
had 5 teenage boys. The lights did not stop them from hanging
out - it just made it easier to see when something illegal was
going on....
Jim
Ned Simmons
<6F0A4CBDBBA495D0.CA7742B4...@lp.airnews.net>,
see.my.sig...@l.address says...
>
> I've about given up on those "energy saver" compact fluros.
>
> They don't seem to last anywhere near as long as is claimed (in
> continuous use), the light output never seems as great as the claimed
> equivalent incandescent, and I also wonder about the power savings
> they claim.
They don't tolerate vibration well or frequent on/off cycles. But I have
a 4W in the shop that's always on and has been for about 3 years. This
one has a magnetic ballast rather than electronic ballast, and has a
replaceable lamp.
>
> Unless they have a power factor significantly removed from unity then
> multiplying the current times the RMS voltage suggests that they
> consume about 60% more power than they are rated at -- ie: the 12W
> actually draws about 28W.
How did you determine the current? I imagine the current waveform of the
electronic ballast units would be pretty distorted.
>
> Also -- the strobing effect has to be considered when you're working
> with rapidly spinning tools.
Those with electronic ballasts (the type most often sold as consumer
items) have a switching frequency over 20kHz so are unlikely to cause
strobing.
Ned Simmons
Gary Coffman
>In sci.electronics.repair jerr...@hotmail.com wrote:
>> Why not use a proper space heater with a thermostat?
>
>> Lamps are a lot more efficent than you are saying. They were designed
>> to give off as little heat as possible per watt of energy. This is a
>> loss of heat and a financial gain for your power company!
>
>--> Actually, what I've heard is that the efficiency of incandescent bulbs
>doesn't get better than 10%. Most are in the 5% range, I think. So
>of the 500 watts you're putting into that bulb, at least 450 are ending
>up as heat. (Of course, an electric space heater is very nearly 100%
>efficient. That dim red glow is the only energy that's escaping as anything
>other than heat. The best gas furnaces, by comparison, are around 85%
>efficient IIRC. Of course, gas is much cheaper than electricity.)
Visible light is just a higher frequency form of heat radiation. Whether
you can see it or not is immaterial to the amount of heat it is delivering
to you. Consider, when you heat iron to a welding heat, does the fact
it is white hot make it radiate heat to you less strongly than when it is
at a black heat?
Gary
Gary Coffman KE4ZV | You make it |mail to ke...@bellsouth.net
534 Shannon Way | We break it |
Lawrenceville, GA | Guaranteed |
Eastburn
With a heating coil and a thermo sensor.
All RF Ammeters use this technique. - Antenna current measurement...
RMS is based on the effective heating .. as it seems to me.
Martin
--
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder
Martin Eastburn, Barbara Eastburn
@ home on our computer old...@pacbell.net
Peter Duck
see.my.sig...@l.address (Bruce Simpson) wrote:
> I've about given up on those "energy saver" compact fluros.
> They don't seem to last anywhere near as long as is claimed (in
> continuous use), the light output never seems as great as the claimed
> equivalent incandescent, and I also wonder about the power savings
> they claim.
> Unless they have a power factor significantly removed from unity then
> multiplying the current times the RMS voltage suggests that they
> consume about 60% more power than they are rated at -- ie: the 12W
> actually draws about 28W.
Without a wattmeter I wouldn't try to guess at the power:
spiky/phase-shifted current (as measured by a moving-coil meter?)
times voltage might be almost anything, but I doubt that the makers
are all liars.
I've used them for about fifteen years, in all sizes from 5 to 23
watts, and they seem much more reliable now than at first: the light
output does decline over life, but the eye isn't particularly
sensitive to this.
The economics probably differ widely between countries: I buy them
now only when there are supermarket, etc., 'offers' at below 5UKP/$8,
and with power in the UK at about 7.5p/12c /KWh they'd still be very
well worthwhile even at a fraction of the claimed life.
Plus you can feel that you're slightly slowing the rate of global warming ...
--
Peter Duck <pd...@zetnet.co.uk>
William Sommerwerck
circuit.
Daniel Narvaes
>--> Actually, what I've heard is that the efficiency of incandescent bulbs
>doesn't get better than 10%. Most are in the 5% range, I think. So
>of the 500 watts you're putting into that bulb, at least 450 are ending
>up as heat. (Of course, an electric space heater is very nearly 100%
>efficient. That dim red glow is the only energy that's escaping as
anything
>other than heat. The best gas furnaces, by comparison, are around 85%
>efficient IIRC. Of course, gas is much cheaper than electricity.)
There are gas furnaces available around 90 or even 95 percent now, I think.
You're right about incandescent bulbs. I've used them as heaters when I
didn't have anything else to use.
Ted Edwards
> >doesn't get better than 10%. Most are in the 5% range, I think. So
I'd be interested in finding ones that good. As I understand it a few %
is tops.
Ted
Danny
>
> --
> Peter Duck <pd...@zetnet.co.uk>
I'm tired of winter, bring on the global warming! Hehehe, have a very
merry Christmas everyone!
Danny
Gary Coffman
>I'm tired of winter, bring on the global warming! Hehehe, have a very
>merry Christmas everyone!
>
>Danny
Just think of it as throwing another log on the fire to stave off the
coming ice age. It has been speculated that it was the rise of the
industrial revolution which halted the so-called Little Ice Age.
(Climatologists still don't have a plausible explanation for the
Little Ice Age, though there is speculation that it was associated
with the Maunder Minimum, or perhaps increased global volcanic
activity.)
Gary Coffman
That's why fluorescents or sodium vapor lamps are preferred. They
have a better efficiency in producing visible light.
mull...@advinc.com
Gary Coffman <ke...@bellsouth.net> wrote:
> (Climatologists still don't have a plausible explanation for the
> Little Ice Age, ...)
Well, this is not such a big deal. The lack of explaination on this
one particular issue has to be considered in light of similar
inability to explain many other climate events. So it's not such
a big thing overall.
ppierce
>
> > Plus you can feel that you're slightly slowing the rate of global warming ...
> >
> > --
> > Peter Duck <pd...@zetnet.co.uk>
>
> merry Christmas everyone!
3/4 cup of NONFAT eggnog
1+ capful of Good Brandy
dash of nutmeg
Warm to suit, Microwave for about 1.5 minute.
Cheers and a Happy New Year to all.
--
Paul in AJ AZ, NRA Endowment Member, MSC stockholder (150 shares)
Checkout http://www.deja.com also("Dropbox")http://www.metalworking.com
Checkout (MWN)the Metal Web News at: http://www.mindspring.com/~wgray1/
Checkout the FAQ at: http://w3.uwyo.edu/~metal
Gary Coffman
>In article <7NRkOB+CMhAhHy...@4ax.com>,
> Gary Coffman <ke...@bellsouth.net> wrote:
>
>> (Climatologists still don't have a plausible explanation for the
>> Little Ice Age, ...)
>
>Well, this is not such a big deal. The lack of explaination on this
>one particular issue has to be considered in light of similar
>inability to explain many other climate events. So it's not such
>a big thing overall.
It is a big thing when you consider our governments are putting
in place regulations with the potential of literally trillions of dollars
economic impact based on predictions by these same climatologists
about global warming. If they can't explain a gross climatic event
like the Little Ice Age, how can we have confidence in their predictions
about something much more subtle?
In the 1960s some of these same people were touting a coming new
ice age. Were they wrong then, or are they wrong now? Perhaps they
were wrong both times. Some of these same people were pushing the
idea of nuclear winter before the Gulf War. The Kuwait oil fires gave
hard evidence that their predictions were wrong (the pollutants rained
out much more rapidly than their models predicted). Etc.
The only thing to which these people have consistently held is a firm
anti-human anti-technology attitude. Practically the entire environmental
movement, and the doomsters in particular, hold an attitude that says
anything which benefits Man is automatically bad. That makes me
automatically skeptical of any claims that they put forth.
I note with some interest that the Clinton administration has just put
in place regulations which they claim will make our air 90% cleaner.
We've heard that before, twice before as a matter of fact. If the claims
are all true, then our air will be 99.9% cleaner than in 1967. Does anyone
actually believe that?
Even if it were true, is that final 0.9% actually worth as much as the first
90% or the second 9%? The cost increment is about the same, are the
results about the same? I don't think so. I think we're well into the area
of diminishing returns.
mull...@advinc.com
Gary Coffman <ke...@bellsouth.net> wrote:
> On Sat, 25 Dec 1999 20:38:01 GMT, mull...@advinc.com wrote:
> >Well, this is not such a big deal. ...
> It is a big thing when you consider our governments are putting
> in place regulations ....
Oops. Sorry, Gary - I was being ironic there. I have pretty
short use for the climate folks who show the real temperature
variation data, and they look like scrambled eggs. "Oh, you
have to analyze with our model, and make all these corrections
to see the real trends..."
Right.
I once heard that 80 percent of the hydrocarbon emissions
were eliminated when they got rid of road draft tubes, and
went to crancase ventilation systems.
And how come all the trucks and busses and SUVs are all exempt
from this stuff?? The world-o-politics gets stranger and stranger,
especially when the politicians and the climatologists realize
they can team up and make some hay...
Gerald Miller
control lab office. It consisted of a standard slide rule with the cursor
replaced by a rubber band with tag attached stating "New model **** quality
control lab slide rule with rubber cursor for flexible answers" :-)}
--
Gerry
London, Canada
<mull...@advinc.com> wrote in message news:845flb$k9i$1...@nnrp1.deja.com...
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Bill Freeman
>I've about given up on those "energy saver" compact fluros.
>
>They don't seem to last anywhere near as long as is claimed (in
>continuous use), the light output never seems as great as the claimed
>equivalent incandescent, and I also wonder about the power savings
>they claim.
>
>Unless they have a power factor significantly removed from unity then
>multiplying the current times the RMS voltage suggests that they
>consume about 60% more power than they are rated at -- ie: the 12W
>actually draws about 28W.
>
>with rapidly spinning tools.
I tested a few of these "energy saving" fluros myself. In every case they
required significantly more amps than their rating indicates. Seems like UL
or the FTC would make these manufacturers be more honest in rating the
power draw. The only place I use them now is in my EXIT lights. I was
having frequent burnouts of low wattage incandescents whereas the fluros
hold up much longer.
Sam Goldwasser
factor. They may indeed be consuming the advertised Watts.
--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html
Robert A. Barr
Sam Goldwasser wrote:
> Measuring amps alone doesn't mean anything. You need to know the power
> factor. They may indeed be consuming the advertised Watts.
Exactly. This topic was addressed at length at alt.homepower, and included a response from one of the
manufacturers.
I was curious about the light output, so I used an inexpensive photoresistor and a DMM in a closed basement
setting, and measured the resistance as a function of time after power-on of a CF. Since I don't know how
non-linear the photoresistor was, it's not possible to give a quantitative result, but the gist is that
these things put out a LOT more light after they warm up. The output is still increasing after 20 minutes
at room temperature.
Nutshell -- in a direct comparison with incandescent, they are bound to appear substandard when both bulbs
are flicked on -- which is the setup used at home centers.
As for bulb life, I'm not sure how many bulbs you'd need to go through before you have a valid statistical
sample; I've had a few that died very young, and some that have lasted over 5 years.