Macbook Air Live Video Output is dark despite professional lighting setup

Hi. I teach online live classes. I just bught a new macbook air. I have been connecting my external camera to it with a video capture card device to livestream my class on Zoom and Streamyard. This is what I was doing on my old laptop as well which was not a macbook. Unfortunately ever since I switched to the macbook air the video output of my livestream/recording is very dark even though I use a professional lighting setup. At first I thought maybe the lights I was using weren’t enough. Then I switched back to my old laptop to test it and the video output became better again light wise. I think maybe it is a setting in my macbook air that needs to be changed. Can someone please guide me on what to do?