Cannabis plants need extremely intense light to produce prodigious quantities of firm, dense buds. Professional growers often use high intensity discharge (HID) metal halide bulbs for the vegetative stage and high pressure sodium HID bulbs for the flowering stage.
Operating these high wattage bulbs is an expensive proposition, and valuable light can scatter if it’s not redirected onto the plants. So, using a reflector hood around each bulb avoids wasting light.
But reflectors may not be enough. It’s sometimes necessary to add reflective walls and a reflective ceiling, which can be difficult to do in a large grow room. Framing the walls and ceiling then sheeting with drywall converts a very large space into one or more smaller spaces. Then, by covering the walls and ceiling with a reflective surface, almost all of the light that escapes the reflector hood can be captured and redirected.
In addition, it’s much easier to control the climate in a smaller enclosed space. But if the idea of compartmentalizing large spaces sounds like an enormous task, you can surrounded them with lightweight wooden frames and attach a reflective surface. Or sheets of a reflective material can hang around the edges of the grow room.
To capture the maximum amount of stray light, walls and ceiling should be covered with a reflective surface, such as white paint or film. White paint has almost no light-absorbing pigment and reflects the majority of the light that shines on it. Flat titanium white is the brightest shade of white and reflects the most light.
Instead of paint, reflective films like Mylar and Foylon—and even aluminum foil—can be applied to the walls.
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