You said:
>Sorry about the long Physics lecture ;-)
Thanks.
Actually I knew all that. it's just that I had never bothered to check, given
that I use a high pressure mercury vapour lamp for alternative processes, what a
low pressure MV lamp was, although I had wondered, even out loud sometimes, but
nobody ever seemed to think that it was something that required getting up off
one's arse to look up !
I had not realised that there is mercury in ordinary fluorescent tubes used in
the home and offices in that all my years of dealing with the things I have
never come across a reference to the mercury. They are just referred to as
fluorescent tubes in the UK.
The HPR 125 MV UV lamp I use has its highest peaks at 365, 546 and 578 with
lower peaks at 400 and 435 nm. It is lamp specifically designed for printing and
reprographic use. I find it far more flexible in use than tubes. It gives a
diffuse even light. But I have just bought a sun bed with six six foot tubes
for classes. It cost L 25 out of Loot. People are beginning to realise that
health lamps are not very healthy
I am getting so many on the all day Saturday class that I need to split it to
run one on Mondays as well. Anybody out there who knows anybody out there who
might want to make it to Twickenham on Mondays ?
Just a small question. Surely even with AC, we have 230 volts and 50 cycles,
the tubes have a negative and a positive terminal ?
Bob Schramm