[jdpman]

Your question is answered in the stickied thread at the top of this forum:

Why is my backlight always staying on?
There have been reports, including myself with issues with the Backlight staying on even when you put the phone to sleep. As well as your backlit navigation keys at the bottom. Obviously a real battery killer! To fix this, we need to disable Windows Mobile's Automatic Adjustment and Dim settings.

From within Windows Mobile
Tap START - SETTINGS - SYSTEM - POWER - BACKLIGHT
Tap to Uncheck - Automatically adjust backlight
Tap to Uncheck - Dim backlight if device is not used for: in the On Battery Power section
Tap to Uncheck - Dim backlight if device is not used for: in the On External Power section
This should keep the backlight from staying on now, and definitely increase battery time!

Also, it seems that if your backlight for the hard keys at the bottom is on when booting Android, they will get stuck in that state. It is recommended before launching Haret, that you wait for the Backlight on those keys to go out.