Does the Radiance Daylighting Measure install illuminance sensors or do these need to already be present in the model?

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Great thanks! Just as a follow-up: I implemented the "Add Daylight Sensor at the Center of Spaces with a Specified Space Type Assigned" measure. This measure does not take sensor orientation as an input and when I viewed my model in Sketchup, I saw that all sensors were facing North (regardless of which facade the space is on). Does the orientation matter and, if so, is there a way to control it without manually adjusting each sensor? I'm also a little uncertain by the second part of your response. I add illuminance points after translating to radiance? This doesn't already need to be present?

OK so that orientation does not matter, since the sensor is calculating horizontal illuminance (luminous flux integrated over the entire hemisphere). That (z-rotational) orientation is used by Energy plus for some of its "glare" calculations, but if you are not relying on them, then no, the rotational orientation does not matter.

Sorry, that other bit was confusing. You need some illuminance map in the spaces for the Radiance translator to work, but you could do a secondary process in the Radiance measure itself that re-does all the illuminance map points and overwrites the .pts files that the Radiance ForwardTranslator writes out. Make sense? In short, the Radiance Measure is a proof of concept that tries to do a lot for you, and makes a lot of ASSumptions. It makes sense to kinda get in there on your own, make a copy of the thing, and write some new methods that kinda step into the workflow and do things better.

You could add a routine to the "add sensors..." measure that just plops in a dummy map that's wired to the space, it could be centered in the space and like 1mx1m, and then in (your) Radiance measure you could totally rewrite the maps points based on the actual geometry (what a concept!), or something. If you do it right, you could just insert yourself in the workflow there and let the original Radiance measure pick up from there, using your new points files for the calculations, and that data for the daylight metrics.

Okay great! Thanks for the thorough response. So in summary: add sensors and arbitrary illuminance maps just to get Radiance to work and then edit the maps later if necessary.