Blue light is light with an approximate wavelength of 445 nanometer. It comes from HPS lights. Blue light is required by the cannabis plant to create chlorophyll.

Learn all about growing and lighting:

More lighting related terms:

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

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

World Icon

500 Helpful Articles

200 detailed grow guides

Group Icon

35,000+ Daily Visitors

500,000+ Grow Bible readers

Plant Icon

100 Hand-Picked Strains

8,000+ connected businesses