Reduce flickering on cheap 220v AC GU10 LED Lamps
the flikcering issue caused by 100 Hz frequancy on driver, solve this problem only one way that using flikering free LED lamps which will be use a flickering free driver inside. 

you can easy use a camera to check if it is flickering.

I know a China supplier have such GU10 bulbs, refer to www.henhui-tech.com
or www.isoled.at also have such bulbs.