Torr, a service life of about 500 hours can be expected. Denka Model 3 LaB 6 cathodes are designed as direct replacements for tungsten filaments. Used at low temperature. Usable at low temperatures and crystallized end changes slowly. Easy operation thanks to its large spot size and broad adjusting range.
Stability is high.
Invulnerable to thermal expansion or vibration. Ordinary technology needed. Angular distribution is sharp, 1.6x10 -2 rad. Used at high temperature. Long life but shorter than flat tips.