Lumatek Digital Ballast , which can use both mh & hps blubs . sorry for the double post , kind of stoned & hit the wrong button :thumbsup: never tried runnin my lights for 24-0 , always felt like they needed some dark time for recovery & growth but ur grow is goin great :thumbsup: keep up the good work :thumbsup: want2beagrower :stoned: