i made my one from a reflector i had.i made a hole for the aluminium tube thats atched to a exsoust fan and a hole on the side of the reflector and it works my temp is 25c ,i can feel the hot air on the other side of the fan that its pushing out
Get a "bake a round" off eBay. Then you cover your light with it and add some ventilation. Viola project done. And yes they work quite well if you have them setup properly.