This is some footage from inside our thermal test chamber of our 3U CubeSat Double Deployed solar panel undergoing a deployment test at -40C and +80C.  We used a webcam and LED light to capture the footage (yes, it was a bit of a camera environmental test too).  Note, during the hot test the deployment is hindered by the panel catching on a anti-static mat inside the chamber, but it still deploys :o)