WOW!!!!!!!!!! Guys go to radio shack. How easy is that. I have emergency lights that I can turn on in my living room. It has a fire fighter theme. Got the converter at radio shack. Got the lights from GALLS. com.
They make them in all different sizes and amperages.
If I remember right, mine is a 12 volt 100 amp and cost me 75 dollars. It was three years ago. It was something like that.
Take a look good luck. Lord know that I couldn't build one.