Converts Light Temperature into RGB color

UnityLightTemperatureConvert.cs

/*
Copyright 2019 ScruffyRules

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;

namespace ScruffyRules {
    public class UnityLightTemperatureConvert : Editor {

        [MenuItem("CONTEXT/Light/Temperature to RGB")]
        public static void TemperatureToRGB(MenuCommand menuCommand) {
            Light light = (Light)menuCommand.context;
            ConvertLight(light);
        }
        [MenuItem("GameObject/Light/Convert all Lights Temperature to RGB")]
        public static void TemperatureToRGBAll(MenuCommand menuCommand) {
            Light[] lights = Resources.FindObjectsOfTypeAll<Light>();
            foreach (Light light in lights)
            {
                ConvertLight(light);
            }
        }

        private static void ConvertLight(Light light) {
            SerializedObject so_light = new SerializedObject(light);
            if (so_light.FindProperty("m_UseColorTemperature").boolValue) {
                so_light.FindProperty("m_UseColorTemperature").boolValue = false;
                so_light.ApplyModifiedProperties();
                Color rgb = Mathf.CorrelatedColorTemperatureToRGB(light.colorTemperature);
                light.color = rgb.gamma * light.color;
                // light.colorTemperature = 6570.0f; // Probably leave this disabled for a "just in case" thing
            }
        }
    }
}
#endif

Place this script in your project in /assets/Editor/ UnityLightTemperatureConvert.cs

You can then run it from the menu: GameObject > Light > Convert all Lights Temperature to RGB