This electronic ballast from Lumatek is the perfect addition to your hydroponics setup. Designed for use with 400W HID lamps, it provides reliable and efficient power to help your plants grow strong and healthy. With a voltage of 120V, it's easy to use and install, and the purple color adds a stylish touch to your setup. Compatible with a wide range of grow light ballasts, this electronic ballast is a must-have for any serious grower. Tested and works as it should.