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PUBLISHER’S LETTER
www.siliconchip.com.au
Publisher & Editor-in-Chief
Leo Simpson, B.Bus., FAICD
Production Manager
Greg Swain, B.Sc.(Hons.)
Technical Staff
John Clarke, B.E.(Elec.)
Peter Smith
Ross Tester
Jim Rowe, B.A., B.Sc, VK2ZLO
Reader Services
Ann Jenkinson
Advertising Enquiries
Leo Simpson
Phone (02) 9979 5644
Fax (02) 9979 6503
Regular Contributors
Brendan Akhurst
Rodney Champness, VK3UG
Julian Edgar, Dip.T.(Sec.), B.Ed
Mike Sheriff, B.Sc, VK2YFK
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ISSN 1030-2662
Compact fluorescent lights
are not economic
While most people don’t worry at all about
their electrical energy consumption, more and
more people are becoming efficiency conscious
and are doing as much as they can to save
electricity. One recommended way of doing
this has been to install compact fluorescent
lamps (CFLs) in place of standard incandescent
lamps. All the electricity authorities promote
the use of CFLs and indeed, Sydney’s “Energy
Australia” is currently giving away CFLs to
domestic customers.
On the face of nominal power consumption ratings, a CFL is a far better
proposition than an incandescent. For example, a 15W CFL is typically
quoted as having a light output equivalent to a 75W incandescent lamp.
That’s a big saving in energy and and easily justifies the much higher price
of CFLs, in view of their much longer rated life which is typically quoted as
five to eight times the life of an incandescent lamp. But in our experience
and the experience of many others, they simply don’t last that long. In fact,
our experience has been that they often don’t even last as long as a typical
incandescent lamp.
Think about it. Given a few hours use a day, an incandescent lamp can
be expected to last about a thousand hours or about a year. If your mains
voltage is high, it can be a lot less and if it is low, an incandescent can last
for years. On that basis, if a CFL is conservatively rated at five times the
life of an incandescent, ie, 5000 hours, it should last for five years or more.
Two brands in front of me at the moment (GE and IGA Evanmax) quote
an expected life of 8000 hours. That’s a very long time. So how many readers can categorically state that they have had a CFL last for 5000 hours or
more? Not many, I would bet.
In my experience, they can fail much sooner than a typical incandescent
because of outright failure of the ballast electronics or the tube itself fails.
Not good. In fact, we tried a succession of CFLs here in our office to replace
incandescents which were on all day, five days a week. We were lucky if the
CFLs lasted a few weeks. My impression was that the CFLs were possibly
failing because of spike voltages superimposed on the line. And maybe that’s
what causes their early failure in domestic use as well.
When you are paying $10 or more for a CFL you expect them to last a very
long time, perhaps even longer than a typical 36W fluorescent tube. 36W
tubes in our office would probably last about three years at best and that
would be about 7000 hours. But 36W tubes are much cheaper than CFLs.
CFLs have recently become much cheaper and some of the hardware
chains have had them down to few dollars. But in my opinion, unless you
get them as a giveaway from your local electricity distributor, “they’re not
worth a candle”. Which is a great pity because the concept is good.
Next time you go out to buy a CFL, take note of any lifetime claims on the
packaging, keep your receipt and the packaging, and be prepared to ask for
a refund or replacement if the unit fails prematurely. Otherwise, you could
be throwing your money away.
Leo Simpson
* Recommended and maximum price only.
2 Silicon Chip
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