Easy to do. 

What you have to do is activate the Volumetric lighting in the light options.  You will then be able to play around with the settings as needed for your scene as far as power and so forth.  Hope this helps. :)

 

Poser Pro 2012/3DS Max 2013/Adobe Photoshop Elements 10/Zbrush/

PC: HP Z820 Workstation, 3.30 ghz 8 core Intel Processor, 2gig nvidia Quadro, 16 gig of Ram and 2TB Hard Drive.