If all of the LEDs are dim, that is due to a low voltage battery, or an old worn battery. The best course of action for that is to place the flashlight in a window and let it charge, then try testing again. If the LEDs are still dim, I recommend replacing the battery with a new rechargeable battery.
If not all of the LEDs are dim, or the above solutions do not work for your device, check the [[Nokero N400 Troubleshooting]] page.