I have several "ring" lights in my finished basement. This is unheated
except the heat that comes from the furnace itself so it is usually
about 55 degrees F. When it is very cold outside (this morning was
-2°F) the lights won't come on when the switch is first turned on. It
takes two or three tries and then the light comes on. When outside
temperatures are more moderate there is no problem. The line voltage is
a steady 120 volts. This happens every winter. What can cause this?
Your standard fluorescent fixtures/bulbs are known for having trouble
both starting and producing full, non-flickering light in low
temperatures. Once they warm up, they may or may flicker, but they will
usually come on. When you apply current by turning the switch on and
off you are warming them slightly so they start.
I know that they make zero-degree fixtures and zero-degree tubes, but I
don't know about rings. I "upgraded" from a standard 2-bulb 4 ft
fixture in my garage to a zero degree set up with much satisfaction.
The folowing deals specifically with compact fluoresents, but most
standard fluoresents will behave the same way. From:
"Like other fluorescents, operation at cold temperatures (under around
50-60 degrees F) may result in reduced light output. Starting may also
be erratic, although most compact fluorescent lamps seem to start OK at
temperatures near freezing. Many types start OK near zero degrees F.
Operation in an enclosed fixture often results in full light output in
cool surroundings after the lamp warms up for a few minutes, as long as
the initial temperature is high enough to permit a good start. However,
enclosing compact fluorescents often impairs their ability to work well
at higher temperatures."
Are they grounded? I have a bunch of them I'm using as temporary lighting,
and they are not grounded. Most of the time, most of them don't come on
until I touch them. Then I grounded them all and they all come on properly.
"---MIKE---" < firstname.lastname@example.org> wrote in message
Note: Not all high output lamps are cold rated. However it seems most
Start with checking for a good ground, next replace them with fixtures
and lamps that are cold rated. I suggest getting really good fixtures as
the cheap ones tend to have far more problems and also tend to buzz.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.