Triac dimmers were never meant to be used with LEDs....triac dimmers were only meant for use with incandescent light bulbs...however, some manufacturers are trying to make their led drivers compatible with triac dimmers.
Triac dimmers are "leading edge dimmers", whereas the other type of dimmer is a "trailing edge dimmer".
The Triac dimmers are more electrically "violent" than the trailing edge dimmers, but the triac dimmers are a little cheaper.
If the led driver does not have sufficient smoothing and damping and circuitry inside it, then the led driver may be damaged by connection to a triac dimmer. Also, if the led driver does not have a "Bleed" circuit in it, then the leds may flicker when connected to a triac dimmer.
The trailing edge dimmer would be safer for you to try, since it will not damage the led driver, but may make the leds flicker.
Generally, led drivers that are compatible with triac dimmers or trailing edge dimmers have no electrolytic primary side dc bus capacitor inside them.....so if you open it and see a large 400v electrolytic capacitor then its probably not meant for triac dimmers or trailing edge dimmers. -Thats not to say though, that there are nt ways that such dimmers can be workable at times with both types of dimmers mentioned.