Triac (TR1) dims to nominal 10%. 0-10V analog (AN2) dims to 5%. Lutron (L21 & L23) dims to 1%. Lutron (LH1) dims to 1% and features Soft-On, Fade-to-BlackTM. eldoLED SOLOdrive (EA2, LA2, ED1 & LD1) dims to .1%