[Richard Muller]

I know this is really old, but I was having the same issue, and I changed the “falloff” option under “light options” from “smooth” to “none.”

I’m sure there are different reasons why this could be a problem. I know another problem I’ve had in the past is that the “point of interest” for the light started off behind the objects, so it wasn’t casting light on them.

Hope either of these solutions help!