PhilB

Yes, I would not normally dim a non dimmable LED. I just find that the dimmer in a 2477D is much more compatible with LED lights than either the 8 or 6 button KPL, even though none of them are actually rated for use with LED bulbs of any kind. I suspect that the dimmer in the KPL switches is not the same quality as the dimmer inside a 2477D, and therefore has issues with LED bulbs. Likely you would need to have only incandescent or halogen bulbs. Even if you had six 10W LED bulbs, once dimmed past a certain point there may still be issues or inconsistent operation due to the low current requirements for LED bulbs.

I don't find the issue is directly related to LED bulbs. I have issues with using the dimmer on any 6 button dimmer keypad. I either use it only for on/off functionality by setting the local settings to 100% On, and .1 ramp rate. I then use a 2477D to control the load I want to be dimmable. I find even LED bulbs labeled as "non-dimmable" will dim with the 2477D, although the dimming is not linear, nor will the dimming work well below 40%. Using the 2334-232 as a dimmer causes flashing issues for me even if the bulb it is dimming is not LED. I either end up not using the On/Off button at all, or for a load that won't require dimming to avoid the flashing issues. With the 2477D, I have no issues from 0 to 100%. The dimming is linear and works all the way down to the point where the cob chip is just barely glowing at 1%. Each LED (12W or 13W COB) has its own transformer, which is labeled that it supports dimming, and works flawlessly with only 1 down light connected per 2477D, as well as 5 down lights per 2477D switch. I use 1 button on an 8 button keypad to control 6 2477D dimmers controlling a total of 15 12W COB down lights in my living room. The ramp rate is set to 8.5 seconds and 70% On for the scene and for the local settings for each of the 2477D switches. All 15 down lights work in unison either with the single button on the keypad, or with the one 2477D set as a controller. The lights turn on and reach 70% in unison with the single button or the 2477D controller, and dim down to 0% in unison as well. With a 6 Button (2334-232) used as a dimmer, it caused flickering not only for the connected load, but also the other switches it acted as the controller for.