On 25/07/2011 01:34, John Coppens wrote:
> 3) (I suspect) no problems with lifetime, as filaments are not heated.

Still stresses/Strips the "cathode"/"filament at power on.

CFL for example have very short life in applications where turned on/off=20
regularly. I've gone through dozens of CFLs and my conventional tubes +=20
choke ballast + starter are all 5 to 10 years and none replaced.
--=20
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