Lumens measuring contraption... (or just a pipe dream?)

[FmC]

Luxmeters: thoughts, findings, comparison

[image] Going into details here :bigsmile: This post may look a bit technical for some but fear not, it mostly contains things that I picked up about the subject over the last couple of weeks, I am not at all a physicist specialising in optics (I am a biologist). Disclaimer: having said that, I feel free to make errors in what I write down here [image] . Measuring light with a luxmeter is a tricky business, as I have become to understand and as many on this forum have recognised as well. Th…