LightBlink.cs

using UnityEngine;

namespace Assets.PrototypingKit
{
    public class LightBlink : MonoBehaviour
    {

        [Range(0, 1.0f)]
        public float lightMaxIntensity;
        [Range(0, 1.0f)]
        public float lightMinIntensity;
        private Light light;
        public float speed;

        private void Start()
        {
            light = GetComponent<Light>();
            light.intensity = light.intensity + (Random.Range(-0.1f, 0.1f));
            if (lightMaxIntensity < lightMinIntensity)
            {
                lightMaxIntensity = lightMinIntensity;
            }
        }

        private void Update()
        {
            light.intensity = ((Mathf.Sin(Time.time * speed) + 0.5f) * (lightMaxIntensity - lightMinIntensity)) + lightMinIntensity;
        }
    }
}