I urge everyone to experiment with 2 things angles and output. I find the easiest way to spot swirls/defects is on a downward angle as far as your positioning, the light positioning would be either direct or around a 45 degree angle. I find one of the most effective ways is putting the light on the floor angled a 90 degree to me.
I find with most lighter paints, especially non color it's best to use lower lumens around 400 and have a VERY DARK working area. I'll do corrections in a pitch black room with one the led as single light source. Doing this will limit the distractive light that may mask other imperfections. Remember, polished paint is a reflective/mirror like surface. See those imperfections is all about and angles an how much light your throwing at it. Dark paints I almost always run 1000+ lumens. Usually around 1500 - 3500.
Hope this helps.
