I received a new light for testing today. It's the Lume Cube. https://lumecube.com/ There are quite a few of these LED cube lights on the market now but this one has a feature that caught my attention. It has an optical sensor built in and a mode that enables you to use it as a slave flash. I charged it up and tested the slave function in the shop. It works well so far. I'll get it out to the field soon for some further testing.