station_obscurum_unity/Assets/Scripts/Enviornment/EmissiveLightMatching.cs

using System.Collections.Generic;
using UnityEngine;

public class EmissiveLightMatching : MonoBehaviour
{
    [SerializeField] private List<int> indexes;

    [SerializeField] private Light reference;

    private readonly List<Color> colors = new();
    private float initIntensity;

    private void Awake()
    {
        initIntensity = reference.intensity;
    }

    // Start is called before the first frame update
    private void Start()
    {
        foreach (var index in indexes)
            colors.Add(gameObject.GetComponent<MeshRenderer>().materials[index].GetColor("_EmissiveColor"));
    }

    // Update is called once per frame
    private void Update()
    {
        var x = 0;
        foreach (var i in indexes)
        {
            gameObject.GetComponent<MeshRenderer>().materials[i].SetColor("_EmissiveColor",
                colors[x] * (10 * reference.intensity / initIntensity));
            x++;
        }
    }
}