Where is the surface emission for materials to create a light source from a plane? Im currently trying to create a light source from a mesh plane, and a tuturiol explains that i need to add a material and then select surface>emission>strenght 10. I can't seem to find a way to edit surface in 2.72b
Cycles:
Method 1:

Set the render engine to cycles
Go into the node editor
Check Use Nodes
Delete the Diffuse Node X

Click images for larger versions

Method 2:

Set the render engine to cycles
Go into the materials panel
Click Use Nodes
Change the Surface to Emission

 
Internal:

Check that you're using internal
Go into the materials panel
Set the emit value
Check shadeless (to look like cycles)