Troubleshooting Slow Heat-Up in a Glass Heater System

https://thin-heater-technology.focalledger.com/posts/understanding-temperature-control-for-a-kapton-heater

In camera windows, a glass heater must deliver heat in a controlled way. It uses a glass panel combined with a conductive heating layer or heater element. One useful trait is anti-fog capability. Still, thermal stress can change the result