Pretty Good
This was the best app I could find to replace Just Light once it finally became a dinosaur and no longer worked under the new iOS updates. It was the best screen light app cuz it was fast and dumb simple. This app rivals it with some additional welcome features but its slightly slower when it loads and the icon is hideous.
UpRocka about
myLite LED Flashlight & Strobe Light for iPhone and iPod - Free, v3.2