I have a new LED ceiling light in our hall, and installed a compatible dimmer switch (both Leviton). The dimmer has a slider plus a switch, and when the switch is on, but the slider is all the way down, there is still a very small amount of light (less than most night lights, I'd say). I adjusted it as low as I could already.
I was thinking that it could be useful as a night light for the hall, but wondered if there were any dangers or problems doing this. The light is 16 watts at maximum, so I assume the power used wouldn't be very much at a very low setting.