making light fade like in tunnel.

Good evening,
A long time ago I asked how to make light fade like looking into tunnel and did find a way by stacking negative spot lights facing the end of the tunnel away from the camera, but did not like it.

I decided to mess with it some more and found if I place a negative spot light at the end of the tunnel facing the camera at the entrance and turning on "halo" that it looks like it does a much better job.

The problem I have found with negative light is it causes blueish colors and light disturbance when set very high.
Just thought I would share what I learned since I did not try that back then.
Good luck.
Scooter