MiracleLED Grow Lite is a technological leap ahead for the indoor garden. Certified for Garden Centers and Greenhouses - Buy what the Pros use. From Seed to Harvest: These LED Bulbs Optimal spectrum, high efficiency, quality components, and sturdy construction, 120 degree optical lens, higher PAR / Lumen out put per watt than other grow bulbs, maximize Growth; which is beneficial for whole phrase of growth, it can provide your plants with everything they need in the nature and offer your plants evenly light for growth. You just need to adjust the hanging height for different growth cycle.