Budget Lumen Measuring Rig

[Nachtfeuerzeug]

@djozz

@Nachtfeuerzeug

djozz, I bought a Sunche light meter from TA and have found there is approximately a 1% correlation between the Idol 4 sensor and it. The Sunche is ~1% less in readings.

I'll run them side by side to further verify this correlation. If I can find repeatability, I think I should arrive at a decent calibration.

1% difference over all the flashlights that are measured is very good, but maybe your flashlights all have comparable tint and CRI, then different luxmeters, bad or good, will correlate pretty well. The question is will the two light meters still be within 1% of each other if also warm light is measured, or other less normal tints? But if these light sources are the type you will measure anyway, you are completely fine using the phone light meter of course.

I will pay specific attention to tint and CRI. Thank you for your guidance!

[The_Flashaholic]

@zak.wilson

I wrote an app for that… but you’ll still need a source for calibration. The readme talks more about calibration and reducing error with makeshift integrating boxes.

My 4yo son deleted my ceilingbounce app, this morning, it is saying the file is corrupt now I’m trying to reinstall it