Simple enough, but – Lume-X Review

It does lack instructions but I found it easy enough to figure out by trial and error. It is basically another camera app that can talk to Lume cubes. Good for an off camera flash option for iPhone. Slow, though, your subject needs to be prepared to be in the light for about a full second. One nice thing is the ability to drive the cube(s) while setting exposure. What is sorely missing is access to iPhone X features like telephoto camera and portrait mode.
Review by weezimp on Lume-X.