There are two options for light deprivation greenhouse systems- automated or manual. Manual light dep sometimes referred to as “pulling tarps” is a low-cost but labor-intensive method of practicing the light deprivation method. A motorized auto light dep system allows you to put your cycles on timers and reduce associated labor dramatically at increased up-front cost. Bear in mind if you use roll-up sides you’ll have to manage your air circulation around your 12h/12h light/dark cycles by venting at night.
Benefits of Manual Light Deprivation Greenhouses
Low cost of materials
Good for smaller greenhouses
Can be retrofitted to existing greenhouses
When done well can be just as effective as auto light dep
Benefits of Automated Light Deprivation Greenhouses
Significantly less labor-intensive
More precise timing and ability to schedule cycles
More reliable
Auto Light Dep Kits for Greenhouses
If you are looking for an auto light dep kit, here are the materials you will need. The main parts will be the roll bar motor, the timed roll bar controller, the lashing winch assembly, and the blackout cloth. In addition, you may need some other parts like retention strapping, roll bar adapters, and side clasp roll bars. Hortitech Direct offers many models of light deprivation greenhouse kits that include (almost) everything you need to build a light dep greenhouse.
The HTD-61-LVM100 Greenhouse Curtain Motor can roll up to a 1750 sq. ft. single bar curtain or up to an 875 sq. ft. double bar curtain for light deprivation curtain or other applications.
The HTD-42-CLD-2MO timed light dep controller fully automates light deprivation systems.
The controller converts AC power to 24 Volt DC to simultaneously power two (2) low voltage motors.
This is a multi-phase controller that allows the grower to easily create a custom automated light deprivation schedule.