Modeling a flat-screen monitor

I'm trying to model a computer screen for glare analysis in Radiance. I
have measured luminance values for the monitor showing white and black
screens in a dark room, as well as spectrophotometer reflectance data on
the screen while off. Currently, I'm modeling it using a generic glass
material in front of a glow material, but this creates a lot of specular
reflection in rpict renderings that doesn't match up with observations.
Does anyone have suggestions for creating more accurate Radiance materials
to model the monitor?

Thanks,

Nathaniel