31 May
2008
31 May
'08
1:34 p.m.
On Friday 30 May 2008, Tony Duell wrote:
To me, 'halogen' bulbs (assuming you mean tungsten-halogen, and not
some kind of gas discharge lamp) are a subset of 'filament lamps'.
And yes, they are suitable here
But they are generally not (AFAIK) covered by bans. The only bans I
know of apply to standard edison-base type incandescent lamps. Halogen
w/tungsten filament lamps aren't included.
And, I don't think anyone is considering a ban on incandescent
automotive headlamps, either, for example.
I think a tungsten-halogen bulb would eb fine here too.
The point about using a filament lamp for this application is the
non-linear resistance chracteristic. When cold, it has a low
resistance (and effectively no effect on the circuit), buit this
reisstance rises to limit the current if the bulb warms up, e.g. on
an overload.
I think you missed my ":)".
Pat
--
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
3) In my copying stand, where I need a contimuous
spectrum of
light
Halogen? There are fairly good spectrum flourescent bulbs
available these days, but I've not tried to look at them through a
prism. 4) In my SMPUS current limiter, for obvious electrical
reasons.
Halogen? Maybe a properly engineered RL circuit instead of some
cobbled-together light-bulb current limiter. :)