Even an ambient of 0.01 will emit light with IDL engaged, but if the mesh has a small surface area it doesn't emit much.  This is OK for skydomes, but not for intense sources such as candle flame, computer monitor, or Christmas tree lights.

     A burned-out white cube is OK for lighting a room if placed above and behind the camera.  But if the light source is in camera, then the IDL emitter must emit light from the correct place -or myriad of places (Christmas tree lights)- and the white cube doesn't work.

     In these scenes, I used unseen IDL emitter meshes hidden within the visible lights.  If I could control the proportion of light emitted without burning out the ambient, I would not need the extra "emitter" meshes.  The last one is the first IDL scene I made, just after P8/PPro2010 came out. ^^

Sigh...  The pics are supposed to open a new window, but the forum keeps changing the links back to "open in this window."  Sorry.

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Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5