I ordered the 1000W lights and hooked them up last night. They are very bright and the fans are quiet. They put off a bit of heat so good airflow is definitely important. Since I ordered 2, I have one Thermostat just under the lights, and another right where my tallest plant is and there is a temp difference of nearly 5 degrees F. The Thermo/Humidistat that comes with the light's instructions are in chinese, I have attached a translated version of the manual card to this review. The switch for C/F is on the back underneath the stand (its just a button) I will update this with pictures and a fuller review once they have made it through a full grow cycle. For now though, for the $60/light that I paid these are an amazing value.