We ordered 4 of these lamps, because they are supposedly Dimmable, and they wanted to therefore operate on a 3-tiered lamp with touch dimmer function. The expected function failed to materialize, the lamps are equally bright at all 3 levels, regardless of whether they are hot or cold.
2 stars, because they work fine as normal energy saving lamp and we did not try, if they work at a normal Stepless dimmer.