A "dimmer" smartapp that works?

none of the “dimmer” levels seems to work for my lights when using the smartapp for lights and switches. I can adjust them manually with the wall switch, but no matter what level I choose with the smartapp, they remain at 100%. Any suggestions?

Which apps, which dimmers, which bulbs?

“Smart Lights” smartapp, WD500Z Z-wave Wall Dimmer, low voltage led lights. As I mentioned the dimming works fine from the wall switch, as does the scheduled “on/off” from the smartapp However within the same smartapp, the “on/set level” dimming doesn’t work. Thanks.