Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible

to the canopy of the garden.
    Increases bright light to more plants.
    Delivers light from different angles providing even lighting.
    Increases intense light coverage 25 percent or more.
    Light is closer to plants.
    Economical use of light.
----
     
Light Movers
    Replicate the movement of the sun through the sky with a motorized light mover. A light mover is a device that moves lamps back and forth or in circles across the ceiling of a grow room. The linear or circular path distributes light evenly. Use a light mover to get lights closer to plants. Keep plants at least 12 inches away from a lamp on a light mover. The closer a lamp is to plants without burning them, the more light plants get!
    Light movers make bright light distribution more even. Uniform light distribution makes cannabis grow evenly. Budding branches tend to grow toward and around stationary HIDs. These extra-tall spikes of buds shade other foliage. More plants receive more intense light with a lamp moving overhead. This is not a substitute for more lumens from an additional lamp. It is a more efficient way to use each HID, especially 1000-watt lamps. A lamp that is directly overhead casts more direct, intense light to a greater number of plants.
     
----
Watch out for the following:
    Stretched or leggy plants.
    Weak or yellowing plants.
    Foliage burned directly under the bulb.
    Uneven lighting.
    Light mover binding or getting hung up.
----
     

This is the approximate coverage of a linear light mover. Note the brightest light is close to the reflector.
    Slower-moving light movers are generally more reliable. Fast-moving light movers can cause lightweight reflectors to wobble or list.
    Light from a stationary bulb always shines with the same intensity in the same spot. If upper foliage shades lower leaves, growth slows and is uneven. Light, received by plants from several directions, shines more intensely on more foliage. The light energy is being processed by more foliage and promotes even growth. In nature, as the sun arcs overhead, the entire plant gets full benefit of the light. Most varieties of cannabis grow into a classic Christmas tree shape. This is the most efficient configuration for the plant’s growth. Light reaches the center of the plant as well as all outside parts.
    Commercial light movers supply more intense light to more plants for less money. Growers report that light movers make it possible to use fewer lamps to get the same yield. Light movers increase intense light coverage by 25 to 35 percent. According to some growers, three lamps mounted on motorized light mover(s) will do the job of four lamps.
     
----
Setting up a Light Mover
Step-by-Step
    Step One: Choose the right place.
    Step Two: Affix board to the ceiling. Mount light mover track on board. Attach Sun Twist units to a board that is screwed into ceiling joists.
    Step Three: Run electrical cord via timer to light mover.
    Step Four: Attach supporting electrical wires with cable ties alongside track. You may want to install eyebolts alongside the light track.
    Step Five: Reduce vibrations by backing the mounting board with a vibration-absorbing material.
----
     
    Motorized light movers keep an even garden profile. The HID draws about 9.2 amperes (A). If this lamp is on a 15 or 20 ampere circuit, you can easily add a light mover that draws one more ampere to the circuit with no risk of overload.

Affix a sturdy board to the ceiling. Mount a light mover on the board with joist below. Run electrical cord via timer to light mover.

A simple cutaway drawing of a metal halide reveals the transformer and capacitor in a protective metal box. The bulb and hood are attached to the ballast with 14/3-wire and a mogul socket.
    Linear systems move in a straight line simulating the sun’s path through the heavens. A linear system increases intense light to plants in a linear oval. The area covered by a light mover depends on the length of the track and the number of lamps. The systems use a track that affixes to the ceiling. The lamp moves back and forth across the ceiling, guided by the track. The lamp is fastened to the mover with an adjustable chain or cord. These units vary in length and the speed at which the lamp travels. Some are designed for one lamp, while others are able to move six lamps efficiently. A six-foot linear light mover increases optimum coverage of light from 36 to 72 square feet (3.3 to 6.5 m2)
    Young clones and seedlings might stretch and become leggy if the