Why a static lamp is uneven
Hot center: Intensity peaks under the bulb and falls toward the edges.
Fixed shadows: Leaves that never see a direct angle stay weak.
Mover job: The lamp passes over each zone so every plant gets a turn at the bright spot.
Uniform crop: Same-variety clones finish closer to the same size and date.
Yield and hanging height
Closer hang
Motion lets you drop the lamp without a permanent hot spot
Less spill
More of the beam stays over plants instead of the aisle
Net gain
Former dim zones gain more than the old center loses
Book range
Expect about a 10-20% yield increase from movers
Linear and circular tracks
Linear
Back and forth, usually about 5-6 ft of travel. Some tracks are shorter or adjustable
Small move still helps
Even one foot of travel changes the angle enough to light old shadows
Circular
Arc or rotate. Suited to square rooms. Some reverse after about 270 degrees
Square example
A multi-lamp rotating system is called a good fit for an 8×8 ft (240×240 cm) room
Air-cooled
Accordion duct can travel with the hood. Pick a model that supports your ducts
Spinners and room match
Spinners
Rotate one to four lamps much faster so the blast feels more continuous
Cooler lamps
Extra airflow from spin lets the unit hang closer
Room heat
The lamps stay cooler; the heat still ends up in the room
Pick the geometry
Linear for a rectangle, rotating for a square or circle