Okay, so here's a quick text based tutorial. Not sure if I used this link, so download from here: http://dl.qj.net/psp/homebrew-applicati ... -v011.html
Once installed; hold note and press R. When the menu pops up, under main there's the brightness level, which you can lower below default. Press R until you get to the config tab, and under Default brightness, you can modify that also if you do not wish to do it again manually.
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