Viparspectra XS1500 Pro LED Grow Light[OPTICAL LENSES DESIGN Optical lenses design that ensures more concentrated light and less light loss to achieve the most uniform PPFD for optimal photosynthesis and growth, ensuring plants absorb balanced PPFD in each corner, enhancing balanced growth for healthier growth and higher yields. DIMMING DAISY CHAIN Allows you to connect up to 20pcs XS1500 Pro for unified dimming, especially beneficial for your commercial growing, horizontal and vertical