Walking around with a set of NVG's is just a tad too strange in your average hood, costs a mint, and R blown when one bright light hits those IR sensors. However what darkens your view also darkens a perp's.
On average it takes a human 15 mins to adjust their night vision to optimal, lunar phases & cloud cover also vary that equation. One bright light like a flare blows that, so we trained to shut our aiming eye if we got lit-up, that eye keeps the night vision pupil dilation, open it when the light goes out and it sees what the blinded one misses.
Gun mounted lights (IMHO) give away your 20 & make a perfect aim for a perp, plus most throw off the balance of gun. Large steel mag-lights help but only if U blind a perp with a quick tap-on surprise, walking around with one on gives your 20 away long B 4 U may ever see the perp who can see U & your mag very well. For big dog owners, the night is a time they work best. A perp rushed by a G-shepherd prolly won't get a shot off B 4 the dog is on them or even if they do will prolly miss as they are shooting blind at someting big moving in fast. Many VC learnt a dog was the most dangerous member of a LRRP @ night and even put bounties on some. Let Rover play, until U gain control, sooner or later perp can B disarmed, or have his throat ripped out resisting, and hopefully both U & Rover live. Walking a good dog after dark is eyes/smell and hearing senses U lack but he/she sees/hears and smells anything long B 4 U ever do, like it's high noon, it's their best time of day!
Every scout platoon I ever went out with at night as their doc had a working dog + handler who got OPFOR nailed before they knew what hit 'em. 2nd-chance even makes pretty good canine body armor, but it does slow Rover down just a bit.
Just a canine spin on a human problem.
No good can come of this. That being said, He is my take.
1. Always keep a good bright light for night use.
2. Try to extend the light at arms length away from your body. (this will serve 2 useful purposes)
a. Many opponents will assume the light is centered on you body(Weaver Cross) and aim for the light
b. This gives you a certain amount of security as your light will blind your foe but you will still be able to see him clearly.
3. Don't worry about your night vision. You are just as screwed as your opponent
4. A good flashlight will tip the tables in your favor as you can see and your opponent is "dazzled" (It's hard to shoot past that big imaginary green and purple spot in the center of your vision circle)
5. Many bad guys see a bright light before a near death experience
I have had a surefire save my hide more than once while deployed. The most action it saw was in Las Vegas keeping an eye on our vehicles in the hotel parking lot. Many thugs shun the light and run before you can issue a challenge.