Open reflectors are shaped in a way that both reflects as much light as possible down to your plants, but also ducts excess heat upwards where it can be vented out of the room via fans or other methods.Open reflectors have the benefit of being adjustable, which means that your light can be placed either close or far from your plant and you can change the shape of the reflector to suit your needs. This flexibility, along with their lower price, makes them a popular choice among budget growers.Closed, air-cooled reflectors have a glass sheet on the bottom of the reflector and cool air flowing through from one side to the other, where it is then pumped out of the room.Air cooled reflectors come into their own when growing heat sensitive crops in confined spaces.JUMP TO REFLECTORS