The LED light found on many devices may be the only indication of notifications for many users. The downside is that the LED light, by default, is neither bright nor noticeable—and it could certainly be brighter. Users of the Sony Xperia Arc, Arc S and Pro running CyanogenMod 10 however, are enjoying a significantly brighter LEDs and reaping the benefits of such a simple modification. Sure, those who want brighter LEDs can set custom brightness values through third party apps, but the likelihood of the average user even knowing which particular value is suitable for their specific needs and wants is slim. Thankfully, XDA Forum Member om22 has created a nice little package that rids of all the complications of having brighter LEDs.
Om22 has created flashable Zips for the Xperia Arc, Arc S and Pro that can be conveniently flashed through recovery, resulting in differing LED brightness levels. Working with any stock Gingerbread-based and Ice Cream Sandwich-based ROM of version .587 and .13, three different packages are being offered:
Om22 has assured his users that these LED brightness packages should not damage the LED if used with aforementioned devices, however does not guarantee the same if tried with any other device. He is also taking requests to look into working with other devices.
Xperia Arc, Arc S, and Pro users interested in this modification may want to check out the original thread for more details.
Quick Edit: This mod is now compatible with all 2011 Xperia devices_________