On 10 Feb 2005 16:25:51 GMT, Ian Stirling
wrote:

Were these the ones with really skinny tubes?
I had one early failure (started flickering at 2 hours

Fairly skinny. The 21W has three "hairpin" loops. Made by Osram.
I've got four of them in service, two of which are on pretty much
continually and are now about 2 years old.