I am using Unity 2020.2 HDRP 10.2 and I used the lights that came with new sample scene to create a new interior dark scene but I don’t know why lights keep having this weird behaviour I even disabled Bloom but it did not help.
Sorry for the offtop question. That performance statistics on the right of your screen is some kind of plugin or is it yours?
Plugin mate Graphy
Thank you! This was exactly what I was looking for!
Hey, have a look at your temporal antialiasing settings on your game camera, there is an anti-flickering setting for instance. Have a play with all its settings and try to find a compromise between ghosting and sharpness.
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Hii thanks for your reply but I did try TAA and it made nearly no difference I even tried disabling antialiasing as whole but they won’t stop flickering , it is a bug in HDRP ? I played with many setting none of them seem to make any difference
It’s hard to tell what’s actually happening in your pitch black video. 
Could it just be the light (as in emissive polys) having some z-fighting with the floor?
The lamps in the HDRP templates have LODs, double check they aren’t disappearing under the surfaces or clipping with the floor for instance.
Also, looking at them, they’re fine as they are, but you need to understand that if the room would be incredibly dark, you’ll start getting aliasing as the lamp gets further away, and some of these bright LEDs in the lamp might appear and disappear randomly between frame (just aliasing, amplified by the bloom and exposure).
So, it’s up to you to also design lamps that don’t display that kind of artifact. You could for instance have a dome-shaped emissive part that will always show up and avoid (or prevent most of) the aliasing/flickering.
Tiny bright polys are always a problem in 3d when you can’t super sample, sometimes the assets must adapt.
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For anyone coming into this issue, my fix was pretty simple. It was an LOD issue for my scenario. The actual light objects themselves were too far into the mesh’s housing so when the further away LODs were enabled, the light was actually not fully outside of the LOD mesh. Simply moving my light’s out a bit further from the mesh toward the direction they were actually shining, is what fixed the flickering issue for me on all subsequent LOD’s.
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