I’m using a four shelf mini greenhouse for germinating seeds. Each shelf can hold two standard seed trays. I’m using a heat pad under each tray.
The power bar is plugged into a timer. Lights are on from 7 am to 7 pm.
Each lamp is plugged into a power bar.
With pads and tubes on, the temperature reaches about 85 °F. I can regulate the temperature somewhat by raising or lowering the zipper on the front of the plastic cover.