Groplanner TPO Series TPO640 640W LED Grow LightDesign Concept Groplanner TPO Series is an electronic horticultural LED fixture engineered to replace traditional HPS fixtures. At similar light intensity, this grow light ensures a better control of the growing and consumes 40% less power than traditional 1000W HPS fixtures, whilst delivering a stronger and generative crops with lower temperature and operational cost. Output & Efficiency Run at 640W, Groplanner O series has amazing efficiency of 2.