What is the difference between the DMHL3 and the DMHL3D dimming ballast? DMHL3 is Lutron Hi-Lume electronic dimming ballast; voltage specific; one or two lamps with 26TRT or 32TRT only; Minimum dimming level 1%. DMHL3D is used in linear products. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.