⦁ Black ( Horror EDITION DLC 1.1 Update )
⦁ White (default)
If you export the steeetlight '.yft's in 'v_traffic_lights.rpf' to XML using Codewalker's RPF Explorer & then open them with Notepad++ etc & search for '<Lights>' & then '<Colour', you can edit the '<Colour' lines for different parts of the light ('<Type>Spot</Type>' & '<Type>Point</Type>' in this example (see pic), but might be other types in other light 'yft's etc).
If you want to change the colour of the glass light fitting, you'll have to find all these textures & edit them:
Vanilla locations of 'prop_streetlight_head' are here:
but you might have other locations you need to edit also, depending on what mods you have installed etc.
If you do a Codewalker Binary Search (CW > 'Tools' > 'Binary search...') for 'prop_streetlight_head' you'll find all the file locations pertinent to your game:
Search in files for: = prop_streetlight_head
Only = .ytd, .ydr, .ydd (no need to search every file in the game etc)
'Save results...' to save a ''SearchResults.txt'' file after search completes (will probably take ~1hr to complete full search on SSD)
Half the results will be for the game folder, the other half for the 'mods' folder, you'll want to figure out which ones the game is loading (depends what '.rpf' archives you have in your 'mods' folder, some vanilla game folder files may be getting loaded in places etc) & delete the other entries from the 'SearchResults.txt' file to get a list of the exact files you will need to edit
Up & down lighting you can edit in the timecycle files by changing these '<light_artificial_' values: