Unsure of a direct solution for the headlight issue, and as you say, its primarily affecting non-kunos car mods, it could well be related to the influx of ongoing updates for CM, CSP, SOL... Try and isolate the issue by reviewing CSP settings ingame...
For a quick workaround without touching the car-data-files, you could use the ingame solution - as follows:
View attachment 1012981
The VRC Ariel is used here as an example.
- open the 'Sol Plan Selector' app
- if app-window already expanded - skip - next step...
- otherwise click down-arrow to expand app-view - like so...
View attachment 1012982
The green-selection area shows a sliding bar setting for the headlight-range (for whatever car-mod you may be using - hence, changes are mod-specific).
I've parked the car in a dark spot to showcase this example - notice the home at the far distance (centred within the selection area) - by default the headlight range is set at 50%.
Set at 0%
View attachment 1012989
Set at 300% - now reaching the far distance home... (you could almost see what's cooking through the kitchen window -
humour)
View attachment 1012990
Other headlight-related tips:
- check CM/settings
->
car instruments
->
weather FX
->
lighting FX