To create the most advanced spectrum for complete physiological plant growth, we had to challenge every assumption. Not only did this make the spectra better, it made it beautiful. 660 nm (red) and 450 nm (blue) were the most efficient LED packages, and coincided with peak Chl A and Chl B absorption areas. Other range has meet the key photoreceptors and pigments. V1 Spectrum is a full-cycle spectrum optimized for rapid growth and complete plant development.  Tailored for growing plants from propagation to senescence (germination, clones/cuttings, mothers, vegetative and flowering applications) in indoor environments.  With a CRI rating of 80, V1 Spectrum offers a beautiful work and research environment with vivid colors and greater contrast to study the health of your crop.