I've got an 8D Coleman florescent lantern. It is the one that looks rather like a white gas style one with a red top and the place where the fill port would be is a yellow nightlight. It has a high and a low setting and I believe it uses a 15 watt ccfl bulb. I don't really notice much output difference between high and low. I do know that it has lasted two camping trips, running several hours each of two nights now, on the same set of batteries (running on low since, as I said, I really don't see much output difference).
Anyways, does anybody know what the actual light output of this lantern is and what sort of reasonable runtime I should expect from it using 8 D cell alkalines (and would NiMH Ds give me any better runtime)?