DIY lumen measuring device. Integrating shpere, and lumen tube.

Flashlight Modding and DIY Parts
6

Thanks for the support gang :+1:

You could use that. You would probly need to darken the outside with paint or tape etc to keep light from escaping since the walls are thin/clear ish. The large hole could be your flashlight entry and the small for your sensor. With a round ball you will also need to make a baffle to block light from the sensor coming directly from the flashlight.

djozz has some a good example of the baffle here.