Spot Light color fade in Unity 3d

Question

I have a scene where many spot lights are focused on the screen. All have red color and same intensity. What I want is that the red Color(0,0,0,1) value should increase and decrease in a fading effect over a period of time. I thought of using Color.Lerp() but can not achieve it. What currently I am doing is attaching this script to all the instances of the SpotLight.

void Update()
{
 if(Time.time()%120==0)
   transform.light.color=new Color(Random.Range(0,255),0,0,1);
}

I know I am missing something big here. Help is appreciated. Thanks in advance.

Answer 1

The problem is on the line if(Time.time()%120==0)

By doing that, you divide the timestamp by 120 and then compare if the decimals are zero. That will happen really rarely as the timestamp will have quite a lot of different values. What you should do instead is to calculate the colour every frame. Perhaps something like this will do:

void Update()
{
    transform.light.color=new Color((Mathf.Sin(Time.time()) + 1) / 2,0,0,1);
}

This will smoothly increase and decrease the light over time. The "magic" is in the Mathf.Sin() method.