Yes, the visible spectrum aids in plant growth. Actually, every color in the spectrum promotes cannabis growth throughout the whole life cycle.
Even though it may seem white to us, natural light is actually composed of a wide spectrum of hues. When light is passed through a prism or a rainbow appears, you can observe every hue.
Changes in the color spectrum can affect the way cannabis sprouts, matures, and even forms buds! When cultivating cannabis indoors with grow lights, we have nearly total control over the spectrum of sunlight!