This script will make any light marker of any color change to red every 1 second and change back to its original color, on the internals of 1 second.
- Apply to a Light Marker (not an entity)
- Light Marker needs to have Static mode disabled
To change the internal length, change the local variable called delay[e] that has a value of 1000 to anything you like. Keep in mind that 1000 represents about 1 second. So a value of 5000 would be around 5 seconds.