Strange problem with low energy light bulb
"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
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