I've gotten in the habit of hitting CTRL-A and CTRL-C before I hit submit in case I get logged out. I just login, refresh, and paste my post back into the box. You're not the only one! :)
I forgot to do that, and was really put out. Wonder why they don't fix this issue?
Anyhow, I'm a big fan of run time vs brightness. In some of the more extreme emergencies a person might go for many months - or even years - without getting a resupply of batteries of any kind. So 'making do' and conserving has been part of my planning from the gitgo.
During the Cold War lighting in shelters was a definite issue. Back in 1976 Cresson Kearny wrote a government booklet about the construction of an expedient shelter.
http://www.scribd.com/doc/35738762/Expedient-Shelter-Construction
Going a step further than most, he took his entire family out into the country, built one of his designs, and occupied it for more than 72 hours. On page 64 of the linked file he tells how the failure of his lighting system caused the major crisis of the experiment. Some people just don't handle extended periods of total darkness very well.
A fairly recent book I believe many people on this forum would find interesting is titled "At Day's Close: Night In Times Past" by Roger Ekirch. In the old days, the combination of superstition, general poverty and low levels of lighting technology made the night a very grim time indeed! The dimmest light I own - the 1.5 ma "low" setting of the Pak Lite Ultra would be vastly better than anything a backwoods peasant could afford. And in terms of safety, there could be no reasonable comparison.
Getting back to the thread's subject, I'm reconsidering the "one flashlight" which will reside in my car. A new 4D Xenon Maglite may get the nod if an ongoing runtime experiment goes as expected. Tossing the original bulb, and letting 4 large batteries power a low-draw aftermarket LED could give me light for a long time. And with a larger bulb tucked away in the base, I'd effectively have two lights without breaking the stipulation of the thread-starter.
If somebody like Pak Lite were to manufacture a special version of one of their models based on the old PR bulb, I could put it in my 6C or 6D Maglite. With a respectably bright bulb in the front for regular use, my backup 'disaster' bulb would be unstoppable. :)