Thanks Lovekraft, does this resistor take into account that there is (i think) a resitor already built in so that the light can plug straight into a computer PSU (12v)?
ALso, that battery case has got an on/off switch on it which is very good indeed since i can turn on/off for diff songs at a gig!! super!!
I think the best way would be using the radio shack case, and if i need 12v - i could just buy two couldn't I? that gives good battery life, with on/off capability!
I read that I should use Lithium batterys, as they give off a steady current and the light wouldn't dimishish til the bat's went flat?
or would regular's do? Thanks for all the help guys!