31 May
2010
31 May
'10
12:06 p.m.
On 31/05/2010 19:42, Tony Duell wrote:
My sources have dried up :-(
Fliament lamps tend to be a fairly close approximation to a black body
radiator, and thus it's not too hard to filter the output to give
something approaching daylight.
Yes -- just in case you were wondering, when I referred to "ordinary
domestic bulbs" above, I meant ordinary domestic energy-saving ones.
Some flourescents have a horrible
Agreed. I
bought a few "daylight" incandescents (the ones with the blue
coating) shortly before they became unobtanium.
I thought I'd seen those listed fairly recently.. 3) In the copying stand (the light spectrum from a CFL
is useless for
colour photography)
You can now get pretty good daylight ones, and in fact you
can get
lighting kits that use them because they produce much less heat for the
same light output as umpteen hundred watts of incandescents. But
ordinary domestic bulbs have a pretty awful spectral output, and
different brands have different characteristics. The proper daylight
ones are seriously more expensive than ordinary domestic ones. spectrum with all sorts of gaps in it that is almost
impossible to filter
to anything close to daylight.
Yes, and to add insult to injury you can't even tell by eye which of the
two most common types you're looking at (one needs a green filter and
one a magenta one, roughly, but even those rarely give proper colours).
Does anyone know the exact terms of the ban? I
understand that the ban
only covers domestic ligthing, and it;s legal to sell filament lamps for
other applications, Is it legal for me to import them myself for my own
use (particularly id that use is not 'domestic lighting')?
I don't know about importing, or even the exact terms of the ban, but
the only exemptions I recall seeing are for medical lamps.
--
Pete Peter Turnbull
Network Manager
University of York