The supported import formats (such as .obj) do not support light sources.

But, yes, you can add (several) light sources to the SH3D properties if you use the Furniture Library Editor and edit the file with the properties. See for instance thread 5206 and SVG mini guide pages 9-10.

However, for normal use, placing one of the included lightsources within or next to your lamp, is probably easier.

ok