Hands up anyone who knows what a light meter is? You at the back… speak up… No, it’s not a way to tell how much electricity you use to illuminate your home. Fine, I’ll tell you: it’s what we used to use to measure light and set the exposure on our cameras, back before they were so good at doing it themselves.
Oddly enough, this weekend I found myself in need of one. And then what do I see in my inbox? The Lumu, a light meter for the iPhone.