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necessities to 
✿ Owner: Kayla vector pixels tutorial
Make sure you're done with setting up the vector psd layers. I have a tutorial on that if you don't know how.You'll be making something like:
the steps
1. Hold in CTRL on your keyboard and select the thumbnail of the base of the rays you want the pixels in.
and now those rays should be selected.
2. Open this brush pack > {click here} and define it as a brush.
Create a new layer. Click on the PENCIL tool (right click on the brush tool and you'll find the pencil tool). Choose a pixel cluster and use the pencil tool to place them in the rays. That's it!
Here it is zoomed in
Finished Product: