I didn't like the glowing effect and I found that could be turned off by stdMatEmissiveCoef = 0,0,0
Then use the ambient light instead by using stdMatDiffCoef = 1,1,1,1
I found the ceiling was also lit by what happens above, so if the floor above is in full daylight, so will be your ceiling below, even in an enclosed dark room!
If you set stdMatLightingEnabled to non-zero and use stdMatBaseTextureEnabled = true, the whole thing goes black. If stdMatBaseTextureEnabled = false then it stays bright, but of course you can only have plain colours if you don't use a texture.