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What is a Hood?

  A hood is the reflective cover used with an HID grow light fixture  

What is the Function of a Hood?

  The most important aspect of a hood is its ability to reflect light downward. While LED grow lights are designed in such a way that all light is concentrated directly onto the plants, HID bulbs feature a 360-degree distribution of light. This reduces their efficacy, as all photons directed away from the plants are ultimately photons—and energy—wasted. Reflective hoods minimize wasted light by reflecting as much light as possible down onto the canopy.