How to make transparent texture light effect?

Hello to everyone. I want to give light effect to my transparent texture. I researched this subject and i found solution. i decided to use shader material. But vertex shader and fragment shader is more complicate for me. Can you help me?

my texture:

the effect thats what i want to show you:

Have you considered to place a textured sprite right over the circle and use AdditiveBlending to create a simple bloom effect? In this way, you don’t have to implement shader code. The map should be a grayscale, semi-transparent texture. Stuff like that is often used to fake light shafts or rays.

Firstly, thanks for your answer. But i am new to three.js and i don’t know how can i do this. Can you share me a little code.