The digital revolution is here! The Lumatek Electronic Ballast produces up to 20% more light output (lumens) than standard core and coil (magnetic) ballasts while drawing less electricity. More light equals more yield. Test data has shown that a Lumatek 600 watt digital ballast produces only 5% less usable light than a 1000 watt "core and coil" ballast. Digitals do not degrade and will maintain their efficiency throughout their entire life. Over time magnetics become louder, produce less light, emit more heat and use more electricity. All System Cord Set (required) sold separately.