[Arfa Daily]

"Phil Allison" wrote in message
...

"Half a Brain Daily"


Agreed that *should* be the case, but the fact is that the envelope of a
vacuum light bulb remains substantially cold in use,


** Only true if the bulb is made from a special grade of quartz glass with
very low IR absorption.

Eg: " Infrasil ".


whilst a 6L6's envelope will take the skin off your fingertips after a
few minutes use ...


** Made with IR absorbing glass, as are nearly all light bulbs.

Some low powered lamps and most "pilot " bulbs are vacuum lamps and they
get damn hot.



...... Phil



Ok, I'll buy that.

Arfa