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Front lit devices provide more even lighting than clip on book lights or lights incorporated into cases. Also with a frontlit reader you have a lot more control over the level of light. Most external lights have 2 or 3 light settings at best, a front lit device has several light settings. This makes it more useful in all settings. You can adjust the light level, say when in darkness. Also there may be times when lighting is not optimal but a clip on light would be too bright, whereas you can turn on the front light to enhance reading.
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