Custom texture for halos?

Hi I’m trying to make lights look like lights, and I tried using the default halos and it looks kinda bad, I’ve tried making particles but it would always start flashing, I’ve tried making a billboard UI but it would always be squished and it wouldn’t look in the right direction even with a script making it look towards the camera. Is there any other solution? The only solution would probably be a particle system but I can’t seem to find an answer to the flickering problem. And by flickering, I mean by a white square randomly flashing over the halo.

Update: the problem only seems to happen in the editor I guess, I’ll try it out a few times if the flashing still occurs