Rafal wrote:

Thank you.
I was looking for same sort of W/sqm figure
and I definitely like a lot of light.
One more question.Came across opinion that electronic /switched mode/
transformers
are prone to overheating inside of well insulated /packed wool/ ceilings
and switching off for cooling or failing.
Is it true? All my celings are well insulated.


Both types will overheat if stuiffed inised insulation. You need to
create a (supposedly fireproof) box these days with enough airspace
round the light to allow the heat to come down to the plasterboard..

Transformers of eother type should be outsdie that box, and in a cavity
of their own.

It is NOT normal to insulate between floors of a house. Only the top
floor ceiling is normally insulated. Here in my case I have boarded the
loft, and teh transformesr (toroids) sit on top of teh bioardin in a
nice cool breeze.

If not dimming, I recommend toroids - less radio interference. In all
cases buy decemnt ones. I got all my klit from Newey and Eyre and their
oroids have been good, apart from one that kept tripping out that was
buried inisnulation for wa while, but even when pulled out it did it,
and it looked burnt, so I replaced it.

If you want, you can use a single transformer for several lamps, but
each one needs a fat piece of 13A cable at least to feed it ..in general
its easier to run 240V around and drop down locally for each lamp -
there is little in it pricewise.






Rafal


"The Natural Philosopher" wrote in message ...

Rafal wrote:


What size is your kitchen? My is 3.40m X 2.40m, 2.70m high
and I planned for 4 x 50W 12V lights.
Looks like it may not be enough




for really bright light, use anout 25W/sq meter. Which means you need
about 8 50W spots.

You will get by with 4 tho.