The HLC-3e by Custom Automated Products guards your garden against overheating and your light from hot starts. The HLC-3e constantly monitors your garden temperature with an attached wire probe. If the garden exceeds the temperature that you have set, the HLC-3e shuts off your lights so crop damage will not occur. It will then turn on the “Temp Exceeded” light to let you know that an overheating situation occurred. When the temperature returns to normal, it will turn your lights back on.