I'm a flashlight junkie too. Everything from the old angle head army/boy scout light to mag lights, to the latest TRL-HLs on several of my guns. I use headlamps a lot more these days, also those little $5 ball cap lights. And the blue florscent work lights Harbor Frieght was giving away for free with other purchases, probably have 5 of those. They have magnets. We keep one on the refrigerator, one in each car and a couple in tool boxes.
I prefer "all the lumens." Brighter is better! Unless you are inside, over about 500 lum will affect your eyes when splashed on a white wall. The one downside of my gun mounted lights - but it's gonna affect the bad guy more! I have a drawer full of cheap Cree 1,000 lumen lights, red, white, green, black light (for finding scorpions) and ir. So basically I never have the light I need when I need it and default to a single cell pen light on my keychain...
As for cars - I have a jeep, jeeps never have enough lights!
I have 6 KC's, plus the headlights. Two flood/fog on the bumper. Two spot on the winch mount, two more spot on the window pillars. I plan to add two more spots on the pillars at a slight angle to the lower ones to provide a wider beam, and two cube floods on the bumper angled about 45 deg out to better illuminate the sides of the road/trail. I don't like light bars on the roof - they bounce light off the hood, and in dust, fog or snow they'll just blind you with reflected light. In a vehicle it's best to keep the light source out in front.
Not to mention those "kewl" 8 light KC lightbars are like $1,750 plus! And good led headlights are in the $500 plus range.
In operation the four spots I have throw a lot of light about 1/3 mile ahead, coupled with high beams it's plenty. But there's no kill like overkill, so I "need" two more spots, which of course requires a custom welded and powder coated bracket and redoing my entire switch panel to add another switch.
The main floods are street legal and provide up close light - and if it's dusty or snowy I have used just the bumper mounted floods alone. Being low they reflect less off particles into your eyes. I'd like some amber filters that could snap on the lights.
In a SHTF event a couple of IR lights with night viz might be nice to have. But so would a billion dollar lottery ticket, and realistically neither event is likely to occur, so I'm good with what I have.