Okay, It took me a while to figure out what people were talking about with 'lithium AA" batteries by Energizer. Now my question is, how to make the best use of these? Will Li AA batts make a UK 4AA light brighter than a UK2L? I have a 4AA bike light (called a "NiceLight"- anybody else have one?), would a different bulb work better (be brighter?) with Li AA's?