While it's normal to get a flickering effect at low brightness levels (0-10%), sometimes you'll connect an LED bulb and find that it flickers at all dimming levels. This is usually due to a driver incompatibility - ZEN22 and ZEN24 dimmers are based on TRIAC, which is a leading edge driver. If an LED bulb uses a trailing edge driver, this may lead to flickering.
Here's a list of some of the popular brands of bulbs that are compatible with ZEN22 and ZEN24 dimmers:
Here is a list of bulbs we came across that didn't work well with ZEN22 and ZEN24 dimmers:
If you have any of the above brands and experienced flickering, try the new S2 Dimmer ZEN27 which is compatible with a wider range of LED bulbs.
And if you have any other questions about LED compatibility, don't hesitate to reach out!