Electronic low voltage OR Magnetic low voltage refers to the type of transformer used to convert mains voltage (110v in USA) to (typically) 12 volts for some kind of ‘sexy’ lighting. For example the lights in my bathroom are 12v Xeons in pendulum hangers.
My experience
I have LED’s in cans all over my house - and found that dimming them with regular z-wave dimmer switches to be very unsatisfactory - flickering and not possible to get below a certain dim level. I replaced the ones I care to dim to low levels with regular incandescent bulbs and the non-dim areas with straight z-wave (relay) switches - I use leviton VRS15-1LZ exclusively for the relay type switches