Change emission brightness with slider?

Unity Engine
1

I have existing code that changes brightness. But can someone please edit to change the emission(HDR) brightness? Thanks!

using System.Collections;
using UnityEngine.UI;
using UnityEngine;

public class BrightnessAdjustment : MonoBehaviour {
   
    public Slider Brightness;
    float brightnessValue;

    public void bAdj (float brightnessValue)
    {
        brightnessValue = Brightness.value;
        //rgbValue = GUI.HorizontalSlider (new Rect (Screen.width / 2 - 50, 90, 100, 30), rgbValue, 0f, 1.0f);
        //RenderSettings.ambientLight = brightnessValue;
        RenderSettings.ambientLight = new Color (brightnessValue, brightnessValue, brightnessValue, 1);
    }
}
2

Your best bet to track this down is to go to where you change it in the Unity Editor and note the name of the property.

From this you should be able to google into the Unity RenderSettings or wherever else the HDR settings are stored and find the property you need to manipulate.