Unity Script: Changes light to Red/Green/Blue when user press `R`, `G`, or `B` keys.

RGBLight.cs

// RGBLight.cs
// Changes light to Red/Green/Blue when user press `R`, `G`, or `B` keys.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class RGBLight : MonoBehaviour {

	Light light;

	// Use this for initialization
	void Start () {
		light = GetComponent<Light> ();
	}
	
	// Update is called once per frame
	void Update () {
		// Respond to User Keyboard Input

		// Red
		if (Input.GetKeyUp (KeyCode.R)) {
			light.color = Color.red;
		}

		// Green
		else if (Input.GetKeyUp (KeyCode.G)) {
			light.color = Color.green;
		}

		// Blue
		else if (Input.GetKeyUp (KeyCode.B)) {
			light.color = Color.blue;
		}
	}
}