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How much energy does it take to power up a fluorescent light bulb versus keeping it on?
I read once that turning one on takes energy equivalent to power it for four hours.
This would seem to indicate that the overhead for incandescent bulbs is about 5 minutes.

Thanks,
Banazir

Comments

( 14 comments — Leave a comment )
jadziadax
Oct. 26th, 2004 03:30 am (UTC)
Ask a physics major :P

Did you ever finish reviewing those Java books?
banazir
Oct. 26th, 2004 12:51 pm (UTC)
Java book reviews
Ask a physics major :P
As luck would have it, I have several physics students and faculty coming over on Thurday. They are nano people, though.

Did you ever finish reviewing those Java books?
Eh, I was just about to start. Sorry, things have been hectic.

--
Banazir
juuro
Oct. 26th, 2004 03:56 am (UTC)
Apart from the energy overhead, there is the wear and tear of the turn-on transient. Both incandescent bulbs and fluorescents wear faster during the ignition than during steady burn. Nothing to do with energy costs, everything to do with replacement costs.

(Driving by on friendsfriends-view.)
banazir
Oct. 26th, 2004 12:54 pm (UTC)
Thanks
That's why I tend to not turn flourescent lights off, and trask myself for accidentally turning them on.

--
Banazir
idigital
Oct. 26th, 2004 05:32 am (UTC)
I'd heard 15, but I guess everyone has different answers. It probably depends a lot on the starter and the actual tube being used.
banazir
Oct. 26th, 2004 07:39 am (UTC)
Well, yes, but...
I'd still like an order-of-magnitude range.
Any idea why?

--
Banazir
siocled
Oct. 26th, 2004 07:59 am (UTC)
Re: Well, yes, but...
I'd tell you, except I don't remember where I last put the relevant book.
banazir
Oct. 26th, 2004 12:55 pm (UTC)
The last relevant book
The last one! After that one, there will be no more!
(Asimov would be proud.)

... what IS last relevant boonk?

--
Banazir
idigital
Oct. 26th, 2004 08:09 am (UTC)
Re: Well, yes, but...
Because different starters work in different ways, I think.

http://members.misty.com/don/f-lamp.html
banazir
Oct. 26th, 2004 12:59 pm (UTC)
Energy Consumption and Wear-And-Tear due to Starting
Thanks!

Based on that section, I would call the "4 hours" and "15 hours" urban legends FALSE. The wear-and-tear is incurred at the equivalent of hours of burn, not the energy, AFAICT.

--
Banazir
tamf
Oct. 26th, 2004 11:08 am (UTC)
yay!
twiggy and i keep discussing whether it's beeter to leave kitchen light on or switch it off. now we'll... oh *twask*! you can't tell us properly, either!
banazir
Oct. 26th, 2004 01:01 pm (UTC)
Re: yay!
See "Energy Consumption and Wear-And-Tear due to Starting" in idigital's reply above. I think it's better to leave it on if you are going to be back within a few hours (< 4 to 15+, depending on the type of bulb), though it's about brunt-oat bulbs rather than power consumption.

--
Banazir
tamf
Oct. 26th, 2004 01:17 pm (UTC)
puh-lease!
it's way too long! i want simple answers. yes or no? *nirg*
banazir
Oct. 26th, 2004 02:21 pm (UTC)
Easier, quicker, more seductive, and with 50% more elves
it's way too long! i want simple answers.
You know, a certain Avar just told me that!

yes or no? *nirg*
Yes AND no. ;-)

--
Banazir
( 14 comments — Leave a comment )

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