Using a front light mod will drain the batteries a little more quickly than without it. It's a small compromise in order to play day & night without a light source to reflect off of. A backlight mod is much better but more expensive to deal with.
As long as the front or back light mods are installed correctly, there will be no damage to the device. This is beside any areas you may need to cut on the plastic shell to get ribbons or wires to sit correctly. Check out some videos on YouTube to get a better idea of modding them. Check out "This Does Not Compute" on YouTube for a front light mod tutorial.
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