Tutorial Step 1
Make A New Layer (CTRL+SHIFT+N) And name is 'Blast', After its made fill it in with Black. Goto Filter>Render>Lens Flare (Use the 105Prime and 90% Brightness), Try and get the flare as centered as possible and continue on.
Tutorial Step 4
If you want your Light Blast to have some color to it then Bring up Photoshop's Hue & Saturation (CTRL + U), Your gonna want to click Colorize And then play with the sliders till you get what you want.