I just had to replace my second mini-spiral compact fluorescent lamp in 3
weeks (it's the third within 6 months). They were all 20w (100w tungsten
equivalent) in different light-fittings. Two were well ventilated; the other
was not well ventilated, but the fitting is fairly large (ceiling, glass
bowl 40 cm diameter and 8 cm deep). All lamps were mounted sideways. They
had all been in use for less than 2 years, with intermittent usage for
usually no more than a hour or two a day.
On examining them, it looks to me like the usual reason for failure of a
fluorescent lamp - the glass is very black by the filament, suggesting it
has burnt out.
I reckon they have lasted for less time than a tungsten bulb in the same
situation! True they save power, but they are 10x as expensive to purchase.
Also, they are no doubt much more energy intensive to manufacture, and I
would guess far more difficult to dispose of or recycle.
The ordinary "hoop" style of folded compact fluorescent lamp seems to last
ages, even enclosed in a small fitment. Does the mini-spiral perhaps have
an inbuilt design fault in that it gets too hot and overheats?
Some interesting reports (US) can be found at:
wondered what the experience is of others with mini spirals.
- posted 12 years ago