Re: How bright a light?
I found this general guideline:
1-80 Lumens - Very Small - Usually Single Battery General Use, very small area illumination, specialized lights
81-200 Lumens - Small Sized - Can be carried in a holster on a belt, usually 2 or more batteries
Subject Disorientation, Tactical Environments, Police General Use including patrol
200-500 Lumens - Medium Sized - 2 or 3 batteries, most require a holster Police Tactical Scenarios, SWAT Team Weapon Lights, Searching Buildings, Small Outside Area Searches, Home Use Search Light, Hunting and Camping
500-1000 Lumens - Large Size - 9 inches or more, Multiple LEDs, Requires a case or Large Holster for storage, multiple or specialized batteries Large Outside Area Searches, Hunting, Illuminating Game at night, SWAT Teams for Group Disorientation
1000+ Lumens - Medium to Large sized - multiple LED arrangement or large output single LED die, requires case or large holster for storage Newest Technology Replacing many lights in the 500-1000 Lumen Category.
Found here:
http://www.tacticalleds.com/categories/LED-Flashlights/