The little Luxi turns your iPhone’s front camera into a light meter. A what? A light meter, a device that measures the amount of light falling on a subject so that you can set the exposure correctly on your camera.
But wait, doesn’t you camera already set its own exposure? Doesn’t it have a light meter built in for when i want to kick it old school in manual mode? Yes and yes, but this $30 widget might still be handy.
In the olden days, where getting the exposure of your photos right was much harder thanks to the fact that you didn’t get to see the result until your prints came back from the lab, people would sometimes rely on a separate incident light meter, which would measure the light falling on the subject, and not the light reflected by it.
Now, such a piece of hardware is being made for the iPhone…