// Increments the strenght of the Lensflare lf when the Transform tr
    // gets closer to the Lens flare
    var lf : LensFlare;
    var tr : Transform;
    function Update() {
        lf.brightness = 1/Vector3.Distance(lf.transform.position, tr.position);
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public LensFlare lf;
    public Transform tr;
    void Update() {
        lf.brightness = 1 / Vector3.Distance(lf.transform.position, tr.position);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public lf as LensFlare

    public tr as Transform

    def Update():
        lf.brightness = (1 / Vector3.Distance(lf.transform.position, tr.position))