Huh. How about "turn on the light"?
Also when I answered with this, the correct answer given was "kindle the light", which is very unnatural, even if you are lighting a real fire with kindling!
Not fixed yet. Reported it. "Turn on the light" didn't work on 5/10/18.
I think it might be that they have to fix each instance of the sentence separately. So for example, you might have done the text input version and I might have done the word tiles version,which was already fixed. Just a guess...
Put on the light is exactly the same as switch on the light and should be acceptable