The more I think about it I might just start to carry two lights. One like the one Shay described above and one to stab people. I can be a one man fist of fury.
I do carry 2 lights most of the time. I carry a SureFire E2e and my SureFire C2. The E2e is small enough it fits into it is a handy little light category, small and enough light for most everyday tasks. The C2 fits into the category of I either need a Quarter Roll or I need the Power of the Sun for just a few minutes to illuminate something...