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@Liam, nice first question. "Space Loads Definition" objects are resources that are assigned to a space or space type in the model by a "Space Load Instance" object. The space load instance points a definition, and optionally a schedule (although the schedule can also be inherited from somewhere else). The multiplier field, which defaults to 1, is also important for determining the impact of a the load.

Here is the API link for space load instance and image of sub-classes

It sounds like you may have changed the definition objects to alter "Electric Equipment Definition" objects instead of "Lights Definition" objects, but you have not altered the code for the "Electric Equipment Instance" objects to use the new definitions.

The Reduce Electric Equipment Loads by Percentage measure would be good guide to show methods for getting and altering plug loads.

If you can't get the measure running after this, it may help to have it posted somewhere where we can inspect the code, or to get familiar with testing measure from an IDE or command line outside of the OpenStudio interface.

The think the red triangle indicates a required measure argument that has a default value that hasn't bee entered, and the broken paper is probably indicating a problem loading or running the ruby code from the measure. It could be some like a bad variable name or could be something else.