Step 1

Start a new document (600x400) press "D" to reset your color pallete to black and white.(background/foreground color - Go to Filter->Render->Clouds

Step 2

Now go to Filter->Pixelate->Mosiac Set Cell Size to 20 squares. Now apply Filter->Sharpen->Sharpen Now press CTRL+F about 5 times to reapply

Step 3

Now go to Filter->Blur->Motion Blur Angle: 90 Degree, Distance: 999

Step 4

Now go to Filter->Distort->Polar Coordinates select Rectangular to Polar- Next, go to Filter->Render->Lens Flare Brightness: 100%, Lens Type: 105mm Prime Position the lens in the center of the image

.

Step 5

Now apply: Filter->Distort->Ocean Ripple Ripple Size: 15, Ripple Magnitude: 5

Step 6

Use the round marquee tool and make a selection around the white glow. Then go to Select->Feather: 20px

Then go to Filter->Distort->Spherize: 100% , Do it 1 more time but this time 50%

Now you can deselect.

Setting*

Hightlight strenght = 11

Details= 10

Smoothness=7

Step 7

Now apply some radial blur: Filter->Blur->Radial Blur amount: 30, Method: Zoom, Quality: Best

Step 7

Ok we are done, but if you want to add color to your light burst. You can do that by using Hue and Saturation.