OUR CUSTOM MADE (patented) Bimetal thermal regulator switches are included with every sunlight shed. If the air temperature in your grow room gets above 105F, then this switch will turn off ONLY the lights. Heat transfer occurs directly through the metallic base via convection, radiation and conduction in gaseous and solid media.You can rest assured your plants will never burn, which greeatly reduces the risk of fire. Provides peace-of-mind your home is safe.