Measure is shorthand for the commonly used terms energy-efficiency measure (EEM) and energy conservation measure (ECM).
In LightBids, a measure is a way to group line items that have the same type of retrofit. When the same existing/proposed light combinations show up in two or more different zones they will be grouped into a measure.
Measures make it easy to make changes to multiple items at the same time. For example, if you want to change the price for a proposed light, you will have an option to change the price for all of the items in that measure.