Emissive material invisible from by far

Hello, I’m developing a Christmas amateur game. I created light garlands by applying an emissive material to a sphere. I’m bad at optimization because I’m still too beginner. But I guess it’s less resource-intensive than PointLights.

The problem I have is that when I move away, my strings disappear. Can you please advise me how to solve this problem?

I attach screenshots to my message.

Thank you.

The material :

](filedata/fetch?id=1837468&d=1606726649)
2020-11-30 09_43_51-M_BouleGirlandeLumineuse.png](filedata/fetch?id=1837469&d=1606726656)
](filedata/fetch?id=1837470&d=1606726666)

Near :
2020-11-30 09_59_48-Noel - Unreal Editor.jpg

Far :
2020-11-30 09_59_29-Noel - Unreal Editor.jpg

If those are little spheres, they could be culled because of the small size they have on the screen. I would go in a different direction, preferring a shader solution, instead of having that amount of geometry.

Thank you very much. They are indeed very small these spheres. But how to make this shader solution?