How it works: At the bottom you can see this picture has a dark screen with the white thing around it, that white thing is silicone to seal the intake of air, the dark thing is women´s leg stuff (girls use it on the legs) don´t know how it is called in english!! At the top there is three 45w exaust fans, that 2 of them are turned on during the day and of at night. The third one is left on during the night only. So the exaust change air and at the same time cool the HPS bulb. There is a glass with an open spot at the size of the passive intake between the HPS bulb forcing the air to pass though the whole lamp. I can post more pictures later on..the wine bottle is so you guys have the idea of the real size.