Cannabis Grow Lights
WHAT ABOUT LED GROW LIGHTS?
Grow Lights and the importance of Full Spectrum Color
In Grow Lights color is king!
Color is most accurately described by a combination of Kelvin Temperature and CRI.
So K + CRI = Growth
WHAT IS THE “K” – KELVIN RATING?
The K rating is just one way of measuring the color output of a light.
The higher the Kelvin temperature gets, the bluer the light is.
K rating tells you very little about what type of light within the full spectrum is being emitted.
COLOR RENDERING INDEX – CRI
CRI is a numeric indication of a lamp’s ability to render the full color spectrum accurately.
The higher the CRI the more natural and vibrant the full spectrum of colors are.
A bulb with a CRI of 95 or higher is excellent for growing; the sun has a CRI of 100.
Yet only part of solar radiation is used by plants for photosynthesis, the blue to red part of the spectrum.
This Photosynthetically Active Radiation zone contains the wavelengths between 400 and 700 nanometers. Light is measured on a scale in nanometers (radiated wavelength) from 400nm (violet) to 700nm (red).
Most people choose lighting solely based on the Kelvin temperature of a bulb.
As stated this tells you very little about what type of light within the spectrum is being emitted and at what strength.
To get the best Full Spectrum Grow Light, Blue Light and light well into the Red Spectrum, you need High K and High CRI!