For whatever reason, map-placed dynamic pulse lights don't provide any light. It doesn't seem to affect point lights. I haven't tried any other lights.
Picture of attached demo map taken facing North:

There are 8 squares on the floor surrounding a heart-pillar for orientation. Each square has an identical dynamic light placed on it. The light faces the direction of the position of the square. As you can see from the screenshot, the one to the right (East) is dull. Changing the facing angle of the light to anything other than East makes the light work.
