In this tutorial I explain how to make a basic ZDoom script to implement colored lighting to your sectors.
Here's the script in case you couldn't see it in the video:
#include "zcommon.acs"
script 1 OPEN
{
Sector_SetColor (const:1, 255, 0, 0);
Sector_SetColor (const:2, 0, 255, 0);
Sector_SetColor (const:3, 0, 0, 255);
}