Mortimer wrote:
"Tony Quinn" wrote in message
...
In message , Andrew Gabriel
writes
"Andy Champ" wrote in message
. uk...
Lumme that stirred it up - and it was only the RF pollution I mentioned!

A couple of points guys on that long discussion:

Colour Temperature - the CFL is a lot closer to daylight for our
3-colour-sensor eyes than the old incandescent. I daresay people said
Daylight covers a wide range, from dawn (2100K), through to midday
(5600K), through to just before twilight (2100K). Incandescent (2700K)
is a damn good match for daylight at the time we need to start enhancing
light levels for our own comfort at home. What we in effect do in our
homes
is stretch out the early evening period before twilight for which daylight
is 2700K way into the evening/night, both at the colour temperature and
comenserate lumen level (illumination level).

That's interesting because I've found that twilight/dusk are actually very
blue (ie higher colour temperature): if I white-balance my still camera off
a sheet of A4 paper that's outside at dusk, tungsten interiors (real
tungsten or tungsten-balanced CFL) look horrendously red. Using the same
white balance in daylight (either sun or shade) also looks quite orange.


Thats true for dusk, but not sunset/sunrise.

Dusk is in any case a time when our own colour receptors start to pack
in: we tend to see grey only.

Even more amusing was taking time exposures by moonlight: the film
itself (pre digital) would give an overall green cast to the picture.