Mod Version : RandomThings-MC1.9-3.6.8.1.jar
Forge Version : 12.16.0.1811 1.9
Crash report : crash-2016-03-28_11.09.16-client.txt
Description : game crashed when I placed a Light Redirector with this setup on top of grass :
R R R
R L R
X X X
Where R is redstone, L is the Light redirector, and X is Rainbow Lamp. Light redirector placed last.

(Great mod with awsome ideas btw, good luck =))