Trail Sense

Android User Guide Book GitHub

Light Meter

The Light Meter tool measures a flashlight's beam distance, which is how far it can project usable light.

Testing flashlight beam distance

To measure a flashlight's beam distance:

  1. Go into a dark room.
  2. Place your phone on the floor, screen up.
  3. Enter the distance at which you will hold the flashlight from the phone (e.g., 3 feet / 1 meter).
  4. Holding the flashlight at the set distance, point it at the phone screen and turn it on.
  5. Move the flashlight around while maintaining the set distance and keeping it pointed at your phone.
  6. Once the reading stops changing, the beam distance has been determined.
  7. You can click 'Reset' to test another flashlight.

Choosing an appropriate beam distance

The beam distance you need depends on how you will use the flashlight: