QUESTION:
I have been looking at the Radiance/ECOTECT interface. I have sussed out how to generate contour lines and false colour images as well as importing the data back into ECOTECT to generate renderings on the analysis grid.
I assume however from the descriptions in the Help File that this can only be done for illuminance and not for daylight factors. If I try to generate daylight factors using the desktop Radiance the scale is all wrong and I just get a fairly monotone image. Can you please confirm ?
ANSWER:
It is pretty easy to get daylight factors out of Radiance, but not obvious -- you have to trick it a bit. We've never been able to get Radiance's own daylight factor post-processor to work so best to ignore it... unless you are up for a challenge 
The easiest way is to simply have Radiance generate an overcast sky with a global horizontal illuminance of 100. This way the levels it generates are daylight factors. You can do this by simply choosing the Daylight Factor option in the Type selector in the Radiance Export dialog. The only problem with this approach is that Radiance will print the word "Lux" on top of the scale when you generate a false-colour or iso-contour plot.
However, if you choose Grid Pt Illuminance in the Action selector and load the Radiance data back into ECOTECT, the Grid Properties should default to "Radiance Data (%)" anyway.
The second option is to use RadTool (Radiance Control Panel). For this, choose an illuminance view and select Run RadTool in the Action selector. When RadTool pops up, select the Render » Unobstructed Sky Illuminance option then follow the instructions to get the global horizontal illuminance. Then go down to the Post Processor section and choose Daylight Factors in the Image Type selector. Then set the scale to something like 20% and choose Render » Fully Render All Views.
It will prompt you to input the global horizontal illuminance you just worked out in the previous step. You should then get an already contoured plot of actual daylight factors directly from Radiance with DF in the scale.