Our plant growth HPS lamps offer high luminous efficacy. To illustrate, a 400W plant growth HPS lamp offers a high luminous efficacy of 140LM/W, and a 600W or 1000W HPS lamp offers luminous efficacy of 150LM/W. Designed based on low sodium amalgam technology, the plant growth HPS lamp is also eco-friendly. Through light spectrum adjustments, this lamp emits 30% more blue light. This helps shorten the growth cycle of plants and improves their color.