code: function(x, y, r, g, b){
              this._lighting.setLight(x, y, [r, g, b]);
              this._dirty = true;
          }
docs: Set a light position and color
  @method set
  @param {Number} x - The map coordinate position to set lightin on the x axis.
  @param {Number} y - The map coordinate position to set lightin on the y axis.
  @param {Number} r - Red.
  @param {Number} g - Green.
  @param {Number} b - Blue.