I've finially decided to build a high output light like Mac's customs made a few years back. I purchased the 100w 12v bulb and a 2d cell mag light. I'll be turning a custom reflector soon enough. But I cant figured out the specs on the batteries. I can find Intellect 1400 1.2v NiMh in battery packs, but I'm not sure if they are the correct dimensions. Also, I need to modify the switch to handle the larger load. So any information on that would be great.