Happened to stumble upon this entertainingly written blog article, about a very serious issue:
“We are in the finishing stages of a way too long project of building our own home and everything is up to current code or better and has been inspected by the county. So yesterday morning when we smelled what seemed to be an electrical fire we started to do some fast investigating. We went to the breaker panel first then the outlets and switch locations in the dinning room where the smell was the strongest. I then went outside to check the crawlspace vents to see if something was on fire under the house, and nothing.
“So looking up I could see one of the CFL bulbs was no longer lit in a ceiling light and we could see a hint of smoke coming out of it. We flipped the light off and got our tall ladder out. Normally CFL’s are cool enough to unscrew even after they’ve been on for a while. Not this Chinese hunks of shit, it was hot as hell and was developing a zit in the transformer housing of the bulb. If it had been left unchecked there’s a pretty good chance it would have caught on fire. So a word to the wise IF YOU BOUGHT ANY GREAT VALUE CFL BULBS TAKE THEM BACK!”
“I’m really starting to believe that the Chinese are doing this on purpose, what a better way to fight a war than to have you enemy buy the weapons of mass destruction from you, and use them on themselves.”
So, would the house really have caught fire or was this just the normal way for the CFL to expire?
The Consumer Reports 2011 article, Bulbs pose fire hazard reports on another recall for the same reason:
“More than 300,000 compact fluorescent lightbulbs from Telstar Products have been recalled because they can overheat and possibly cause a fire, according to the company and federal authorities.”
And gives an explanation as to how this may happen:
“When a CFL can no longer light, its electronics still try to turn on the bulb, which could eventually overheat and cause the smoke and discoloration.”
However, government agencies and pro-CFL activists such as Project Porchlight, try to reassure us that this is no cause for concern, that actual fires started are rare, and that the foul smoke from dying CFLs is perfectly normal for this product:
It is normal for some CFL bulbs to smoke a little and even show signs of melted plastic on the ballast (the plastic base of the lamp) at the end of their lives. When CFL bulbs burn out, heat builds up in the ballast and the lamp’s safety feature kicks in: the Voltage Dependent Resistor (VDR) – an electronic component that cuts the circuit (like a circuit breaker).
I’m sure it’s not very healthy breathing in fumes from a smoldering or smoking CFL, even if it doesn’t catch fire!!
To minimise CFL fire risk, this is what the San Fransisco Fire Department advices:
The first and most important recommendation from the San Francisco Fire Marshal regarding any product with a
potential fire hazard is to read the instructions for installation, limitations and warnings that are provided with the
Other important safety information (sometimes printed on the bulb itself) related to CFLs that, if overlooked, can
translate into a fire hazard are outlined below:
• CFLs should not be used in track, recessed or inverted fixtures
• CFLs should not be used with a dimmer switch unless clearly marked otherwise
• CFLs should not be used in place of a 3-way bulb, unless clearly marked otherwise
• CFLs being used outdoors must be enclosed
• CFLs should not be used in emergency exit fixtures or lights
I’d also recommend replacing CFLs before they burn out (literally) by themselves, something which you need to do anyway as they tend to get so much dimmer over time.
Do a little test and remove a CFL you’ve had for more than a year (if it has lasted that long) and put in an equivalent incandescent (like the one that you had there before) or a halogen energy saver just to compare the brightness and light quality. You may be surprised!
And never leave any CFLs (or halogen lamps) burning when you’re not home.