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What is a Reflector?

  The term “reflector” is used as shorthand when referring to the reflective hood over an HID lamp.

Why Do HID Bulbs Need Reflectors?

  In the context of indoor cultivation, HID lamps need reflectors to better direct the light they emit. HID bulbs feature a 360-degree distribution of light. Any light shining away from the plants is essentially light wasted. In order to take full advantage of photons emitted by an HID bulb, growers mount MH and HPS bulbs under a reflector that captures light and reflects it back down onto the canopy. LED grow lights eliminate this problem of escaped light with a design that directs all light straight down.