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- I need a simple way of dimming 12V Halogens
January 4, 2007, 8:35 pm
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I work with a preformance arts company doing shows in the scottish
highlands and due to the massive amount of rain fall we need to use
We have been using 12v hallogens with some success but I cant find any
pre-built 12v dimmers. I have found several that use 240v dimmers and
then drop the voltage down to 12v but none so far that start with a 12v
My limited understanding of switch mode power suplys makes them seem
like the logical solution but I dont know enough to pick the right
I have found some that require only couple of external componets and
only a small heat sink.
If someone could point me in the right direction it would save me a
great deal of heart ache.
Thank you for your time.
Re: I need a simple way of dimming 12V Halogens
** Groper alert:
** Are you using 12 volt batteries or AC power ?
** It is generally not practical to *directly dim* 12 volt lights used in
stage performances. Any dimming is done at the much higher AC supply
The problem is excessive "voltage drop" in the cables feeding the lights. A
voltage drop ( due to cable resistance and dimmer losses) of 5 to 10 volts
in a 230 volt system has very little consequence, but in a 12 volt system
it would be a disaster.
This is why you always see 12 volt halogen lamps sited very close to their
step down transformers.