I found a white/dark moire pattern repeating at approx 100 degrees when adding grain in neutral grays while turning this gray to red. The size of the grain is the cause. When using low values like 1~10 the pattern is very strong and can be seen on lores images as well. Increasing the size diminishes the moire. http://www.ruuddekorte.com/moireinlightroom please see my link with examples. Please solve this.