This is Phil from HarnessDR.
The Ambient LED light is a very soft light. It is similar to the light that is always on at night in the overhead console. I found that SUVs use this same light for their footwells and such, created this harness to add that same style to the trucks.
I assume toj want it bright? So that you can light up the floors when you open the doors, or turn on the dome lamps? If so, maybe consider the these?
2014 - 2022 - GM Courtesy Lamp - Harness Dr. - DIY Done Right
These lights will be similar to the dome lamps which output brighter than the ambient led light. These are the same lights you see inside the full center console.
Also note, the LED Ambient Light harness doesn’t come with the light but the Courtesy Lamp does come with the light and harness.
Hope this helps.
Happy New Year!