These lights are, quite simply, the best lights in the world for the display of your photographs.
SoLux lights have a colour temperature and spectral output that is closest to the reference standard for lighting used in colour management systems today. Their CRI (Colour Rendering Index) is above 99 (with 100 being a theoretical 'perfect' maximum).
They are also the best lights for your work area, or print viewing area, as they're the closes match currently available to D50 lighting, so they make the whole process of colour management easier and more accurate.
Below you can see a comparison diagram comparing Solux lights to the spectral characteristic of the D50 Reference and the light source in a GTI print viewing booth (which uses a flourescent light source - you can see the odd spiky behaviour clearly).
You can see from the chart that the Solux light is a very very good match for the spectral characteristics of D50 (and a much better match that the very best flourescent bulbs):
Solux lighting is nearly universally recommended by people in the colour management industry and is the lighting used in major musems like the Van Gogh museum and the Guggenheim.