FWIW,
I use SureFire lights for work, and they're spectacular! I keep two in my H3, and won't use any other light. They're small, the battery storage life is 10 years, and they're extremely bright for their size.
They are USGI Approved for tactical weapons lights and the cheap ones, which are about $30.00, are a steal for the price.
www.SureFire.com
Why take up all the extra room with a MagLite? Besides, the small surefires are about 4 times as bright, and can be stored in any of the 3's compartments very easily.