Get started on your own indoor growing with the 4 Ft. Indoor Seed Starting Kit. This Hayneedle exclusive kit has everything you need. The kit's four-foot 54-watt grow light helps jumpstart the two grow trays' combined 110 seed plugs as does the seedling heat mat and ventilated dome. With this kit you're sure to see your thumbs getting greener and greener everyday. 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.