Quote -  Then, click and say Set Ambient to ZERO in scene.  It'll also change it in Poser, so be warned. =P

And just to clarify: this last step is optional. Moving the emitters to the 'Rejected' list is sufficient to stop them behaving as emitters in the exported scene. When you use the 'Save All' menu option the status of each emitter (i.e. whether it's in the 'keep' list or the 'Rejected' list) is saved too, so you may prefer to do that rather than changing values in the Poser scene itself. 'Tis up to you!

Free stuff @ https://poser.cobrablade.net/