A simple Lua table. See: http://www.lua.org/pil/2.5.html
Array-like Lua tables are typically 1-indexed.
Tables used by prototypes may parsed via an internal class called "property tree". Errors that reference this class treat tables as 0-indexed.
Value must be a dictionary in property tree at ROOT.lab.lab.light refers to element 0 of the property tree array which in Lua is at index 1.