Deciding to purchase a newer Xenarc 7" display with the brightness upgrade, I fired off an email to Xenarc asking for either a recommendation on a compatible dimmable inverter with their backlight, or possibly just a spec sheet of some sort.

In response, A Jimmy Hu informed me that the new Xenarc units have dimmable inverters, accessed from the OSD menu you can adjust the inverter output level.

I should also note, it is possible to dim a CCFL backlight by decreasing voltage - but only a certain amount. Usually by about 30%. I noticed many postings claiming this wasn't possible - but there's plenty of white papers and documents online that verifies and supports the fact it is possible with cold tubes. However, you'd want to start the voltage off at normal, then dim. Also, results may vary with the type of inverter you're dimming.