I seen a device/apparatus earlier for measuring the surface “intensity” ( in Lux ) that would work for measuring & comparing hotspot intensity of flashlights & spotlights at 1-meter.
I recieved my Lux light meter in the mail today, and in the proces of building a Lumen Sphere, and may build the surface rig for measuring Hotspot brigthness too.
Have anyone seen such a set up before ?