Flashlight Nitelight allows you to turn most flashlights into a multifunction nightlight. You can easily socket it on the end, allowing you to use your flashlight as a helpful lamp. All you need to do is print this in scale to the diameter of your flashlight. The instructions attached (PDF) explain on how to scale and choose infill to best print this for your needs.
Its up to you! It changes the way the light diffuses.
See the PDF file for a helpful guide to scale this properly for your flashlight. If you have any trouble following it feel free to leave me a comment.