>Without the use of wires running to the outside, I want to be able to
>turn the LED circuit off and on to save power.
Don't power it with a battey. A solar cell is probably the best way since
it will not produce much heat. To run LEDs you should not need a lot of
current so normal room lighting should be sufficient to energize the
solar cells..
My first reaction was to use solar cells, but that could require wires.
Can the solar cells be attached directly to the LEDs in ice, and still
generate the tiny bit of power for the LED? It's worth trying. Won't it
need resistors?
I used to make sculptures using cast polyester resin with transparent
fiberglass cable embedded in it to provide lighting. The fiber ends had
colored lenses. Only the ends of the fiber emit light through the lenses.
I'd consider using "Throwies" minus the magnets. They can stay lit for
about a month. I've seen them outdoors in NYC in the winter, so they
should stay lit in ice, but not sure how long at 0 degrees C. They're
cheap to make with button batteries and bright LED bulbs if you get the
batteries in bulk or at a dollar store. LEDs come in several colors and
brightness. I haven't found a cheap source for rare earth magnets, but
you shouldn't need them for the sculpture. They also don't need a
switch, but will stay lit longer if you can switch them off.
Throwies: http://graffitiresearchlab.com/?page_id=6
Betty
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