All lights go out and spirits attack, any defense?

[Nat]

A couple nights into hideout 3 in the Old Woods, and after a very successful first few nights of barricades I'm suddenly being hit by something I can't seem to figure out: All the lights in the hideout suddenly go out and I get swarmed by those spirit/ghost things that attack in the dark. When this happens all of my inventory based lights are rendered useless as well, lanterns and torches have no effect and I'm effectively left defenseless until the lights come back on. I was able to heal through this happening once, but when it happened a second time the same night I was just worn down. What am I supposed to do against this?

[Null Winter]

Flares and gasoline puddles.

At least one lamp or wall light should remain active, as well.

[ZZtheTOP]

What ever you do, just remember, Smells like teen spirit gets it wrong,
With the lights out it is not less dangerous, especially if you have perks

[Sachiel]

If you're not in chapter 3 and intend to hold up in a single room, push both the lamps (hideouts generally have 2) into the same room when you get time.

Or as Null Winter said, just light any source of light to keep you safe (flares are disposable, generally last 3/4 night).

[Lemartes]

Either go to the light that stays on or drop a flare.
Just drop a flare,

[Rakasha]

Lol I faced the same situation, except for me, there was no way out, since I barricaded myself in one room and set traps along the exits :D Only one light, that ofc went out and no flares