All serious photographers know the importance of getting their lighting right when capturing photos/videos. A decent light meter can help them determine if a part of their image will be over/underexposed. These devices can also be used for architectural lighting design. The In. Licht Pro is an iPhone compatible light meter with Bluetooth that helps with lighting design. It incorporates the Well Performance index.
This gadget collects an accurate index in seconds. It shows lux, EML (Equivalent Melanopic Lu), CCT, and contrast. It has a footprint of 2.5 x 2.5 inches, so you can easily take it with you anywhere. The companion app lets you monitor uniformity, average, and historical values.[where to get it]