Here are a couple of bright ideas from Milwaukee.
I have this nagging suspicion that many of the lights powered by tool batteries came about because some marketing guy said "quick, design a light so we can throw it in that combo kit and say it has four tools instead of three". That's not the case with these new Milwaukee lights; the manufacturer clearly gave a lot of thought to their design. I could describe them here but the product manager can do a much better job than I can. You can see his presentation in the videos below.