We have connected the LED lights on a dimmer. You can actually specify how dim, but with restrictions. 1. You are only in lighter-thirds truly dimmable, in the weaker start them and go out. 2. A buzzing or chirping of dimmed lights is clearly perceptible.
The positive feature are 1. You have a good brightness approximately in accordance with the specified 40W. 2. The light color is also OK 3. The viewing angle is also good