These 4-pack grow tubes are perfect for starting seeds, growing herbs and vegetables. Each tube produces 1500 lumens of 6500K daylight balanced light ideal for plant growth. The cool white bulbs simulate natural sunlight and encourage healthy stem and leaf development. At 18 inches long with an 18 watt draw, these compact fluorescent tubes provide just the right amount of focused illumination in a small footprint. The low-voltage 12v system is safe and easy to use with any standard transformer. Whether on a windowsill, under cabinets or suspended above seed trays, the long tubes flood plants with an even coverage of lumens. The included bulbs are guaranteed to last for years of use, helping home growers start seedlings and nurture plants year-round.