RE: Lighting Questions.

["Mark Harrison" <Mark.Harrison@xxxxxxx>]

1: They have a far bluer spectrum than normal incandescents - ie they have
a higher colour temperature.

Colour Temperature is not how hot the lamp is. Colour temperature is the
relative whiteness of a piece of tungsten steel heated to that temperature.

- Incandescent has a warm (red) color temperature of around 2700 K
- Some of the good incandescent "daylight" bulbs have a colour
temperature as high as 5000 K, which is equivalent to the equatorial
sun
- Real "daylight" in northern climes has a colour temperature of
about 7000 K, so is bluer still

N

2: No idea :-)

3: Are you talking about main voltage halogens, or low voltage. There are
two types of transformers for LVH - one requires a special dimmer. The
other (more expensive) can be dimmed with a normal dimmer. 

If you're not sure which you have, the test is "consider what would
happen if you dropped it on your foot". If you think it would hurt
your foot, it's the cheaper type. If you think it would break your foot,
it's the more expensive :-)

Regards,

Mark



-----Original Message-----
From: Stuart Poulton [mailto:swp@xxxxxxx]
Sent: 10 October 2002 17:54
To: ukha_d@xxxxxxx
Subject: [ukha_d] Lighting Questions.


Hi Folks,

Wonder if anyone can help out with any of the questions below

1) Anyone know whats special about "daylight simulation" light
bulbs ?

2) I'm after either a basic "how to dim 240VAC" or a circuit for
a 
dimmer with 0-10V input

3) Whats the best way to dim halogens, I'm thinking dimable 
transformers, but what type of dimmer do I need, and is the answer to 2
  suitable ?

Thanks

Stuart



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