About Hydrofarm, Inc. Celebrated as the nation's oldest and largest manufacturer of hydroponic equipment and grow lights, Hydrofarm has made professional-grade equipment available to all since 1977. All grow lights and electric components are UL listed, unlike many competitor products, meaning you get years of reliable and safe use out your high-intensity lights. All products are covered by a one year warranty, at the least. In some cases Hydrofarm ensures the performance of their products for five years. Can be used up to the day of harvest. Does not harm beneficial insects and your plants. OMRI listed. Compliant for use in organic gardening. Extremely effectual on a wide variety of insects. Ideal to use on all fruit and vegetable varieties. Measures 5L x 3.3W x 10.9H in..