LUMOS irradiance results

[Alfie58]

I've set up measuring points on an object illuminated by a fluorescent lamp in LUMOS. I get a chromaticity map but the spectral irradiance shows zero at each of three points (despite visible differences in the intensity of lighting on the object faces in the rendered image, see below). Any advice?

[Frudawski]

I would guess it has to do with the problem of co-planar planes. Try to move the calculation points a cm away from your object. The Nan (not A Number) values in the chromaticity diagram and the irradiance level suggest, that the object sides cover the calculation points in the simulation.