Add Ray of Light to a Scene
In this tutorial, I’d like to share one way of adding ray of light. The first step of this technique is to identify the light source and blurs it to create a ray of light. Once the ray of light has been created, it is blended into the photo.
The following is the effect. If you are interested in it, follow me please.

Step 1: open picture and duplicate the current layer, and then select”Adjust > Levels” to separate the light source from the photo. Using the level tool, drag the gray input slider to the white input slider and click OK.

Step 2: Blur this light source with selecting “Filters > Blur > Radial Blur”.

Set the Amount to 100, the Blur method to Zoom and blur center point to the top middle. If you want longer streaks you can apply the filter again.

Step 3: Blend the ray of light into the image. We’ll change the blending mode of the current layer to Screen.

Step 4: To increase the visibility of the ray of light, duplicate the current layer for several times. And then, adjust the HSL of the top layer to change the color of light.

Then, we got the final results.