To force the cannabis plant into flowering it needs a dark period of at least 12 hours per day. If it receives any light during this time the flowering process will be disturbed. It can even revert back into the vegetative stage.

Learn all about growing and lighting:

• The Cannabis Light Cycle
• Control Your Lighting, Control Your Cannabis

More lighting related terms:

Lighting | Light cycle | Light shortage | Light distribution | Light spectrum | Blue light | Red light | Nanometer | Light tight | Lumen | Lux | Reflecting light | Lamp height

HPS lights | HPI lights | LED lights | Compact fluorescent lights