You can add an optical effect to any light. 
         
         TipThe results of an optical effect (such as flame) applied to a light are not visible in the Scene View. 
               
To see the results, IPR render the effect, then drag a marquee around the rendered object to watch how the effect changes
                  as you adjust it.
               
             
          
            Related topics
            
  
            To create a light optical effect
            
            
               - Create a light for which you want to apply and position optical effects.
- In the light’s , map the  utility to one of the light’s attributes (for example, click the box beside  then select from the  in the window).
               
- IPR render the scene to see the optical effect.
               
 
          
            Re-position an optical light effect
            
 
            You can move the glow or halo you have attached to a light or include more than one optical effect in the scene. 
            
 
            To re-position an Optical FX utility node
            
            
               - Create a  and place it anywhere in the scene (Create > Locator). 
               
- Shift-select the locator in the view, then select the light. 
                  You can now move the locator anywhere in the scene and the optical light effect moves with it.