Editing Lamp Strength with Python I am trying to animate changing brightness of a point lamp using input data that I have. However, when I try to access the lamp's strength using 

bpy.data.node_groups["Shader Nodetree"].nodes["Emission"].inputs[1].default_value


I get the error message:

Traceback (most recent call last):
File "&lt;blender_console&gt;", line 1, in &lt;module&gt;
KeyError: 'bpy_prop_collection[key]: key "Shader Nodetree" not found


Is there another way I can/should access and change the lamp's strength via Python?
Yes, reach node_tree through lamp object bpy.data.lamps['lamp name'].node_tree.nodes.