Maya 2012 Tutorial
How to Add a Lens Flare to a Light in Maya
Lens flare is caused by a bright light in the scene that bounces between the layers of glass within the camera lens. Maya includes an Optical FX node that can be connected to a light's color attribute.
Add a point light to the scene by choosing Create > Lights > Point Light.
Select the light and open the Attribute Editor.
Click the checkerbox next to the Color Slider. Click Glow in the Maya section, then click Optical FX.
In the Attribute Editor, Optical FX tab, click the Lens Flare checkbox.
Open the Lens Flare Attributes section and modify the Color, Intensity and Number of Circles.
As you make your adjustments, render your image using the Maya Software render option.
Within the Optical FX panel you can modify your Glow, Halo, Lens Flare and Noise.