On 2006-06-21, 531Aussie (aka Bruce)
was almost, but not quite, entirely unlike tea:
Quoted message said:
Duncan said:Meanwhile.. 10% of motorists drove past with illegal foglights
illuminated and another 10% with no lights on.
is that what those really bloody bright blue/white things are? Crikey!!
The bright ones on top are just HID lamps.
The ones low down to the ground, are nominally fog lamps, but are
usually very much the wrong colour to be actually useful during fog,
and probably far too bright from same (real fog lamps are yellow,
IIRC; and *ONLY* used during fog).
I'm guessing the legislations for lighting is horribly outdated.
I know that the legislation sets limits for how blue a light can be --
in some cases, "blue" lights are merely HIDs which are really white,
but because your colour balance is off in the dark, appear blue. But
some blue lights truly are blue -- they are cheap imported halogen
bulbs from Taiwan with glass that is dyed blue to make them look
expensive. They actually cut the performance of the bulb, because you
remove useful light from the spectrum (and convert it to heat, yay!).
And I believe the regs set limits for how bright (as well as how dim),
headlights can be.
But HIDs, as we all know, are about 3 or 4 times brighter than
halogens for a given input power. I'm not sure whether the
legislation deals with input power to the light, or with output
luminence.
--
TimC
"Any sufficiently complicated C or Fortran program contains an ad hoc
informally-specified bug-ridden slow implementation of half of Common
Lisp." -- Greenspun's Tenth Rule of Programming