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Thats not what hes asking... You didn't read his question properly, he's talking about the emission of color on the buildings and roads, not the actual emerglights_emis colors
 
So it would go: Step 1 - open GTA IV directory which is located at C:>program files (x86)>Rockstar Games> Grand Theft Auto IV and find the ELS.ini (see red arrow/text below) Step 2 - Open the ELS.ini and find the slot that you have the car installed in (ie FBI) Your looking for this:    [ FBI ] Status = on File = default_config   Step 3 - It will say "File= default_config" underneath it unless you've already created a custom config. Rename "default_config" to "fbi" and save. So it looks like this:    [ FBI ] Status = on File = fbi   Step 4 - Go back to main GTA IV directory and find the ELS folder (see green arrow/text below) Open it and inside will be a file called "default_config" (Unless you've already made a custom file for the car slot in question and if you have then open the config for that car) Otherwise if you haven't already made a custom config then make a copy of "default_config" and rename it to "fbi" Step 5 - Open the "fbi" config and look for [ ENV_LIGHT_COLORS ] Step 6 - Change extra_1 - extra_4 to "blue", extra_5 - extra_6 to white and extra_7 - extra_9 to amber. So it looks like this:   [ ENV_LIGHT_COLORS ] Extra_1 = blue Extra_2 = blue Extra_3 = blue Extra_4 = blue Extra_5 = white Extra_6 = white Extra_7 = amber Extra_8 = amber Extra_9 = amber *** If you tell me what car your using I can give you a more accurate color setup. If you want to try and figure it out yourself, extra_1-4 are the main primaries and would be set to blue. extra_5-6 are the takedowns/wig-wags and extra_7-9 is the traffic advisor/other LEDs. If the car is setup with the secondaries being LEDs and not a T.A. I would say change those from amber to blue ***   Step 7 - Save it, launch the game and test it out. Like I said above, extra 5-6 and 7-9's color depends on the setup of the car but you can change them to blue if you need to If you have the car in a different slot than FBI the process is still the same but instead of looking for FBI your looking for NOOSE or POLICE2. Then instead of renaming "default_config" to fbi you'd rename it noose or police2, whatever the car name is     HOPE THIS HELPS!