In my scene, I created wall from single staticmesh (Shown in figure 1) by duplicating mesh and placing it side by side. There are total ** 4000 staticmesh objects**. I set these static meshes mobility to movable. I set the indirect lighting cache to ICLQ Volume.
Figure 1 :
Figure 2:
Figure 2 indicate the editor view of the wall. Without any problem. Working perfectly.
Figure 3:
Figure 3 indicate the play in editor view of the wall with bright purple (random) light.
I tried with Volume light sample placement scale = 0.1, 0.3, 0.4, 0.5, 0.7, and 1. But result is same.