We have a light fitting with three lights that take a smaller type of globe
than the more common ones. It seems they are blowing much more often than
they should. Does anybody know why? Is the wattage too high or too low?
Or is there a problem with the fitting itself? Do I need to call an
Thanks for any help.
Seems to blow every couple of months. They're just the normal priced
globes. Can't post a pic, no camera. I'm from Australia, I don't know
where you are from, we may have different manufacturers so I don't know if a
description would be useful. It is a Phillips brand 25 watt globe.
In my experience, it depends on manufacturer and batch. Had some miniature
pot lights that took a 35 watt reflector. Bought a box of 12 bulbs, they
only lasted a couple of months each. Bought a second batch of 12 bulbs, and
they last a couple of years each. Finally used them up and bought some
Philips at the local HD store, they are still going and are at least 3 years
old. In the same vein, I have some 50 watt large reflectors where several of
the 19 original bulbs are still in daily use after 20 years. I can't figure
it out, I doubt anyone else can other than brand and batch. You get some
good ones and some bad ones.
Three lights or more are considered Chandiliers, and require special
The filaments of these bulbs are usually more delicate.
Usually, their spot on...120V.........but your house may be higer......
If your pushin' 125 or higer, they'll blow more.
Less than <125...well, they'll come close to the Service life of what
the box says.
Wouldn't think so.
Wouldn't think so.
If you or a friend can take a reading with a volt meter for AC Volts at
that'll tell ya' what ya' got.
120 to I've seen as high as 127V in some.
A 122 average will keep ya' close to the box, with a 120
A 124 or higher average, you should go with 130V bulbs. but they'll be
a little dimmer.
The Blue or orange boxes may have higher voltage bulbs, but if you have
a lighting and electical supply house nearby, you should have a better
Several factors can cause short life.
Heat, especially if the lamps are in an enclosed fixture
Vibration, from machinery or sometimes someone walking on the floor
above a ceiling fixture.
Moisture. This is also a killer, it does not take much.
Poor connections. If the contacts of the fixture are corroded or maybe
lost their "springiness" the lamps may not be making good contact.
One easy way to extend bulb life is to put the lamp on a dimmer
circuit and avoid operating at the 100% level.
You didn't say, but this assumes...
1. Incandescent lamps
2. Shortness of life is not due to inferior quality of the bulbs
Also, you said you were from Australia so I presume we are talking
about 240 volt circuits. One of the other posters mentioned 120
volts, which is merely the North American standard.
The causes I can think of:
supply voltage too high, or voltage surges
If it's a bad contact you would see the light flicker sometimes. You can
measure if the supply voltage is too high or not.
Voltage surges are harder to catch. Other than having a monitoring device on
it, I don't know what else could help.
Did you actually try any of the suggestions? Many are not 'theories',
but proven techniques that address your stated problem. Using
higher voltage globes or using a dimmer will most assuredly give
you longer lifed globes.
I gave them all some thought. It's not moisture. I've never seen any
globes of a different voltage, they all seem to be 240. A dimmer, none of
us actually want at the moment, and can't afford - and why didn't it happen
before, we didn't have a dimmer before. I've put it down to the batch, as
Have you tried a different brand of bulb or a bulb from a different
batch? I bought a pack once of a reputable brand of bulb/"globe" (only
Aussies seem to call them that); most of them lasted only a few hours,
and one or two blew as soon as the switch was turned on for the first time.
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