400~520nm (blue) – This wavelength can directly develop plant roots and stems, and has the largest absorption ratio of chlorophyll and carotenoids and the greatest impact on photosynthesis. Double Ended Grow Light, 630W Cmh Grow Light Fixture , Indoor Garden Grow Light , 630W Cmh Double Ended Dimmable Grow Light ,Led Grow Light 1200W . Observe which plants are completely in the sun? Which ones are in the shade? When do the plants next to the wall get the sun? From this, you can further find out the growth of the same plant in different places, so that you will have a better understanding of the growing conditions required by the plant. The product will supply to all over the world, such as Europe, America, Australia,Malta, Paris,kazakhstan, San Diego.LED plant lights help shorten the growth cycle of plants, because the light source of this lamp is mainly composed of red and blue light sources, using the most sensitive light band of plants, red light wavelengths use 620-630nm and 640-660nm, blue light wavelengths use 450-460nm and 460-470nm.