Dipstix, I really appreciate you for taking your time to share your data with us. However, I would like to point out an issue with your setup. You don’t have a method of trapping the light within your tube leading to alot of light escaping. A proper lumen sphere would trap the light within the sphere. When you measured the Zebralight, a good amount of light and lumen exits the pipe opening. However, when you measure the X70, the flashlight head is about the size of the tube opening so you don’t have the same light/lumen loss. Since you use the Zebralight as a calibration light, the X70 results will be inflated.
Texas_Ace use a reflective disc to bounce light back into the tube and also a diffuser to evenly distribute the light to minimize the effects of flood vs throw on the sensor and it works really well.