Lens Flare bug, sinks into colliders when moving

Here's a script I have written as a workaround, its a bit of a hack and not really a good solution:

 using UnityEngine;
 using System.Collections;
 
 public class Headlights : MonoBehaviour {
     
     GameObject cameraMain;
     
     
      float Brightness=4.0f;
     
     public float RelativeAngle;
     
     public float MinHeadlightAngle=-170.0f;
     public float MaxHeadlightAngle=-30.0f;
     
     
     void Start () {
     cameraMain= GameObject.FindWithTag("MainCamera");    
     }
     
     
     void Update () {
         
     // get positive or negative angle between cameraToHeadlight vector and headlight facing direction
     Vector3 Cam2Headlight = transform.position - cameraMain.transform.position;
     Vector3 referenceForward = transform.forward;
     Vector3 referenceRight= Vector3.Cross(Vector3.up, referenceForward);
     Vector3 newDirection = Cam2Headlight;
     float angle = Vector3.Angle(newDirection, referenceForward);
     float sign = Mathf.Sign(Vector3.Dot(newDirection, referenceRight));
    
     RelativeAngle = sign * angle;
         
     // show/hide lens flare depending on camera's angle relative to headlight    
         CarCameras CarCameras = cameraMain.GetComponent<CarCameras>();
         float distance= CarCameras.distance;
         LensFlare headlightFlare = transform.GetComponent<LensFlare>();
         
         
         if(RelativeAngle > MinHeadlightAngle && RelativeAngle < MaxHeadlightAngle )
         {
             // if visible, adjust flare brightness depending on camera's distance to car
             headlightFlare.brightness= Brightness/distance;
           }
         // if not visible set brightness to 0
         else{headlightFlare.brightness=0;}
     
             
     }
 }
 

Here's another solution. If I set up a bunch of box colliders around the flares, leaving a long tunnel behind them, the flares will stay on and act fairly normal, even at high speeds: