Sun Lighting in Cycles render I'm following a tutorial but it appears to be in an older version of Blender, under the cycles render, I have my Lamp set to Sun but I am unable to find an option to control its strength, I've looked online but wasn't successful in finding and answer, can anyone help me?

Thanks,
Darren.
I found out, one has to enable Use Nodes button (either in Properties editor or in the Node editor with lamp selected) which will make Emission and Lamp Output nodes appear in the node tree used to control strength information.