Could be that. I'll see if I can figure it out when I get time.
I made some glowy shrooms with the ingame light thingy, and I bumped into this problem. Why does the glow disappear at a certain distance? I mean, if it slowly dissipated as you zoomed out it wouldn't be a big problem, but the fact it instantly goes from glowy beautiful to darkness at a certain distance is quite annoying and stupid