The Lumu is a light meter which attaches to your iPhone, it was brought to market with the help of Kickstarter. Your iPhone will serve as its brains and software. It's a nifty little device. Small, practical and more importantly: it works very well!
"Two thumbs up for the Lumu."
Cinema5D did a full review on this little filmmaker-gizmo - head on over to their site to read all the details.
