Best Ballast is these brand cause of longevity but most of of Total Harmonic Distortion ..The balance from ballast to bulb ,there is no distortion... meaning more power to bulb and longer life,not only that they make affordable kits...(As long as you buy from MBFERTS.COM) just professional only,also make Mh bulbs that go all the way purple which is 10k for last two weeks flowering for extra trichomes...have not seen this Color Spectrum bulb no where but this brand write here...Solis Tex... They make all types including switchable,remote,and digital timers are built in the ballast no nead for a timer,Also can run a Single cord that splits so you can screw two bulbs into a 1000 watt digital ballast and run efficiently two 600 watt bulbs wa la,...again for the pro who wants affordable quality at its best,yes better than phantom,lumatek,badass,check for yourself...thanks