Osram 57452 - 50 watt 120/277 volt 50-60Hz Dimmable LED Driver (OTi50/120-277/1A4/DIM-1/L G2 Osram Optotronic LED Driver) - Walmart.com
eldoLED *2743X3 OPTOTRONIC Programmable Linear 50 Watts Constant Current LED Driver, 0-10V Dimmable OTi50/120-277/1A4 DIM-1 L G2 120/277Vac (Osram 57452), White - - Amazon.com