LED – How to make a LED light inside Blender 3D?

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Add a cylinder and shape them
Create anode and cathode
Add a point light in the middle of the LED. Increase the radius of the lamp
Add glass material, give a bit roughness and a lot of IOR. I give 6.2 for IOR and 0.050 for roughness.
Add volume scatter node to volume input and set density which you are comfortable.
And you are ready to render

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