What it is:
Note: 1 - This will work on any device and on any version of Android back to GB. (Obviously the Nexus specific tools wont work on anything other than the Nexus)
Note 2 - You will have to redo this every time you update your rom.
Here's the quick rundown -
First, you'll have to pull the framework-res.apk from your tablet.
This can be done via adb, but the easiest way would be to either use WugFresh's Nexus Root Toolkit or mskips Google Nexus 7 TOOLKIT.
When asked what file to pull, type in "/system/framework/framework-res.apk" (without quotes)
Once you have that pulled, install this tool: http://forum.xda-developers.com/show....php?t=1432152
Follow the directions on how to use it in the thread.
Once you have decompiled the apk, you'll want to edit the "files-to-edit\framework-res.apk\res\values\bools.xml" file.
The value you want to change in the bools value is the "<bool name="config_animateScreenLights">true</bool>" change "true" to "false". I reccommend downloading Notepad++ to edit.
Make sure you save it. Once saved, recompile the apk using the tool you install, then create an update zip (I renamed mine to crtanimation.zip for ease).
Reboot into recovery, flash the zip, clear cache, reboot.