Strange lighting artifacts

[kellyctv]

I'm having some problems with strange reflections / artifacts. I'm using a hemisphere with a vraylightmat for the environment lighting and a vray sphere light for the sun. I'm attaching my render settings, and light settings. Any suggestions would be great. Thanks.

[vlado]

This looks like a hilight from the sun, seen in the reflection. If you disable reflections on the conrete material does it go away? Anyways, it's not an artifact really.

Best regards,
Vlado

[fourthand11]

For the artifacting on the right I'd try increasing the HSph. and Inter Samples in the Irradiance map to something like 100 just to see if theres an improvement. If there is then you can lock in a number that renders faster.