// Pulse light's intensity over time

var duration : float= 1.0;
function Update() {
// argument for cosine
var phi : float = Time.time / duration * 2 * Mathf.PI;
// get cosine and transform from -1..1 to 0..1 range
var amplitude : float = Mathf.Cos( phi ) * 0.5 + 0.5;
// set light color
light.intensity = amplitude;
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public float duration = 1.0F;
void Update() {
float phi = Time.time / duration * 2 * Mathf.PI;
float amplitude = Mathf.Cos(phi) * 0.5F + 0.5F;
light.intensity = amplitude;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public duration as single = 1.0F

def Update():
phi as single = (((Time.time / duration) * 2) * Mathf.PI)
amplitude as single = ((Mathf.Cos(phi) * 0.5F) + 0.5F)
light.intensity = amplitude