diff --git a/io_scene_fbx/fbx_utils.py b/io_scene_fbx/fbx_utils.py
index 7c6b0641e955cfd5f32a0ee42cab924efcf58500..e37c938d19efcc415c155d596d1d5e8f30cf4d4f 100644
--- a/io_scene_fbx/fbx_utils.py
+++ b/io_scene_fbx/fbx_utils.py
@@ -70,7 +70,7 @@ FBX_ANIM_PROPSGROUP_NAME = "d"
 FBX_KTIME = 46186158000  # This is the number of "ktimes" in one second (yep, precision over the nanosecond...)
 
 
-MAT_CONVERT_LAMP = Matrix.Rotation(math.pi / 2.0, 4, 'X')  # Blender is -Z, FBX is -Y.
+MAT_CONVERT_LAMP = Matrix.Rotation(math.pi / -2.0, 4, 'X')  # Blender is -Z, FBX is +Y.
 MAT_CONVERT_CAMERA = Matrix.Rotation(math.pi / -2.0, 4, 'Y')  # Blender is -Z, FBX is -X.
 # XXX I can't get this working :(
 # MAT_CONVERT_BONE = Matrix.Rotation(math.pi / 2.0, 4, 'Z')  # Blender is +Y, FBX is -X.