If you have ever not been satisfied with the standard brightness controls for your PSP now you have a cool alternative that will let you easily control your PSP's brightness.  Be sure to check out the statement from the developer fLash as well as the changelog for version 1.1.

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Main features:
* Load/Save last brightness (brightness.bin to plugin folder);
* Two brightness setps, 1 and 10;
* Show brightness message on screen (can be disabled);
* Lock the combination buttons to the system when pressed;
* Change brightness message color;
* Sincronized SCREEN button steps;
If the current brightness is:
< 44 press screen button: 44
< 60 press screen button: 60
< 72 press screen button: 72
< 84 press screen button: 84
> 84 press screen button: 44

Defaut buttons sequence:
* Key = LTRIGGER + RTRIGGER
* Change UP with step 1 = Key + UP
* Change DOWN with step 1 = Key + DOWN
* Change UP with step 10 = Key + RIGHT
* Change DOWN with step 10 = Key + LEFT

The values can be changed via “brightness.ini”.

Changelog
v1.1:
[+]Fix small bug on LockControls field.
[+]Add show brightness display on startup.
v1.0:"

Source:  http://pspcustomfirmware.com/brightness-control-1-1.htm