How can I change the Highlight Value for a convental fixture

I have several LED products on a project that are made by Nova.  I would like to be able to use highlight to locate them and flash them out.  The problem is that they over heat if they run at full for more than a few seconds.  I would like to change their highlight value for intensity to 2%.  I tried to create a custom fixture for this but was not able to find where I can change the highlight value.  I also tried looking on my computer for the file that was created for the custom fixture and open it in notepad and wordpad but it did not open with anything that was editable.  Anyone know how I can change the highlight value?  I am running 1.9.7 on Windows.  Thank you.

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