In last 36 hours, three light bulbs have blown in my house. One on the
1st floor light ring, and two on the ground floor ring (these 2 blew
the ring fuse as well). Should I be concerned? Normally I only lose a
light bulb every 4 to 6 months.
Thanks in advance.
Would be a lot more concerned if all the light bulbs had "blown" in one
particular socket but three going all over the house, within 36hours, you
can chalk down to coincidence (may be connected to MTBF and the number of
Yours S. addy not usable (not that you would try it) ( )
Utinam logica falsa tuam philosophiam totam suffodiant! / \
Candle bulbs do seem to have a poor lifetime - I suspect due to the
long filament lengths.
I tried different makes to no great effect and eventually just bought
a bulk pack of 50.
To email, substitute .nospam with .gl
The fitting we have uses them cap up; I blame the short life on the
possibility they are meant to burn cap down. This based on experience
of T- series theatre lamps which last for minutes if used outside the
specified burn angle.
40W is the normal max for cap up on candles and golf balls. The problem
is the lamp base (and possibly lampholder) overheating. However, I
would not expect it to affect the life of the lamps (unless the
overheating generates a bad contact). Usually what happens is the
lamp solders itself into the holder.
Thats a different problem -- planear filaments runs are close spaced
and can sag into each other if run in a position which the filament
supports were not designed for.
On 7 Jan 2004 02:47:11 GMT, email@example.com (Andrew
Currently using 60s, never had that problem. Nothing on the packaging
about burn angle.
Got one of those catalogue thingies in a sunday paper recently which
includes compact flourescents in candle format, which might be worth a
Oh, no - no problems like that at all. Its just natural wastage. Candle
bulbs seem to last on average about 6-9 months. I have (thinking
hard)..35 of them roughly, so I would expect one to go on
average...(calculating hard...) every week. It doesn't take much
imagination to see that 5 in one week is a bit tough, but will be
followed by a month or two in which none go..
As I said, I suspect they had the power stations run up for a cold snap
that vanished overnight.
I also get a bit of surge when odd bits of kit come on and off. That
'takes out the stragglers'.
What I suspect, is that the bulbs are on the way out anyway, and teh odd
high voltage/switch n surge.whatever just rips through teh 99th
percentile as it were. taking out the weak and dying as it does so.
I take it the compact flourescent bulbs are more immune to power supply
fluctuations? I have replaced a few incandescent bulbs with energy savers
recently - the packaging reckons up to 5 years lifetime depending on the
number of switching cycles. (they are great as a main light in the bedroom,
the way they come on slowly doesnt blind you first thing in the morning or
if you get up in the middle of the night :o)
I am sure they last longer, but the so called 60W equivalent I put in
outside, casts about as much light as a candle.
Frankly, so far they simply don't work for me. bugger all output and
very poor color temperature.
There are a couple of issues here. Firstly, I suggest using the type
with an outer glass envelope. This will help the fluorescent tube run
at the right temperature in cold and possibly windy environment, which
will otherwise seriously reduce the light output. Last time I was in
IKEA, I noticed they had started doing ones with clear outer glass
envelopes which would be good for this application. (The pearl outer
envelope always results in some light loss.)
The second issue is that the light source is going to be in a different
relative postion from that of a filament lamp. In some luminares, this
might result in light not being guided or reflected as was intended for
a filament lamp.
They are just about all 2700K, which is same as a filament lamp so
the two can be mixed without colour temperature mismatch. Other colour
temperatures can be found with some difficuly. However, I've never
seen any lower values, and you are very unlikely to want higher values
for outdoor nighttime lighting -- they'll look blue.
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