@a63nt-5m1th
I tried lower that setting but, still doesn't help. As I said there is no solution for it, but it's fine. Thanks for your time.

@a63nt-5m1th That's good question. I haven't test it, but I can say it will happen, but maybe in less difference between dark and light. Thanks for your time on this, but I think there is no solution for it. But if you find any it would be awesome . It's very intense on SAHP pack becasue lights are brighter then on other mods. I'm using LSPD, LSSD, and LSSD Extended.

@a63nt-5m1th It works, but as you can see on the screenshots dark screen effect returns when you look back.

@a63nt-5m1th Your solution is strange see here:
https://imgur.com/a/Mifc4Cp
https://imgur.com/a/xvAMYTn
I tested it on:
https://www.lcpdfr.com/downloads/gta5mods/datafile/23298-better-radiance/
but it should be irelevant.
(sorry for late answer I didn't get notification and I had pause from GTA)

@Aurora11 Oh, btw that dark effect happend on other cars too which I have (LSPD and LSSD pack from 11john11) but it was less intense than on SAHP pack.

@a63nt-5m1th @Aurora11
Ok I tried some settings.

1. Change size to 0 in
   Adaptation.min.step.size 0.15
   Adaptation.max.step.size 3.0
   Adaptation.step.size.mult 1.5
   Didn't help.

2. Then I tried changed Adaptation.threshold to 5.0 - didn't help. Then I tried change ONLY Adaptation.threshold to 5.0 and it didn't help too

3. I tried delete whole # Adaptation section - didn't help.

4. I tried play with car.defaultlight.day.emissive.on
   and car.defaultlight.night.emissive.on
   and it works .

I changed some more things in visualsettings.dat:

	car.indicator.day.emissive.on		to	250.00
	car.indicator.night.emissive.on		to	150.00
	
	car.reversinglight.day.emissive.on	to	25.00
	car.reversinglight.night.emissive.on	to	25.00	
	
	car.defaultlight.day.emissive.on 	to 	500.00
	car.defaultlight.night.emissive.on 	to 	150.00

Now emergency lights look good and bright. I nearly removed dark effect or completely removed. Other settings are because in this mod indicators are too bright and reverse light is not bright.

Ok thanks for help.

@a63nt-5m1th Thanks for tips. Tomorrow, If I will have time I will test your solution. That darking effect happens only on cars from SAHP pack.
https://www.gta5-mods.com/vehicles/sahp

Hello guys. Is there any chance to disable this dark screen effect when I turn on lights on police vehicle? I'm using this mod for lights https://www.lcpdfr.com/downloads/gta5mods/datafile/18520-better-emergency-lights-16/
Lights off - https://imgur.com/90c6u2l
Lights on - https://imgur.com/a/9PYr7ia