Light.spotAngle

Description

The angle of the spot light's cone in degrees.

This is used primarily for Spot lights and has no effect for Point lights Additional resources: Light component.

using UnityEngine;

public class Example : MonoBehaviour
{
    // Change spot angle randomly between 'minAngle' and 'maxAngle'
    // each 'interval' seconds.

    float interval = 0.3f;
    float minAngle = 10;
    float maxAngle = 90;
    float timeLeft;

    Light lt;


    void Start()
    {
        lt = GetComponent<Light>();
        lt.type = LightType.Spot;

        timeLeft = interval;
    }

    void Update()
    {
        timeLeft -= Time.deltaTime;

        if (timeLeft < 0.0)
        {
            // time to change!
            timeLeft = interval;
            lt.spotAngle = Random.Range(minAngle, maxAngle);
        }
    }
}