I've got the LumeCubes and honestly they are not all that bright. You need to raise the ISO a lot for video at night (which gives you noise), stay less than 15 feet away for a decent exposure, and expect they will illuminate a small circular area of the wide-angle lens coverage. The light is sort of purplish too so you might need to filter them with a Lee Zirconium LED filter pack taped over the face (#801 filter I think in the pack to balance towards 5200K). A couple of my mounts broke too, but they replaced those.
As it is, I don't use them other than using them to locate the drone easily in the dark. For that purpose they work well. To illuminate something properly you need to be pretty close in, expect noise in the blacks, and deal with vignetting too with the small circle of light (Like a flashlight on a night wall of a building 20 feet away.).
If you are familiar with a light meter, here's a sample I found. Meter shows ISO 100, 1/125 sec. @ f/11 and at only three inches away! Inverse square law anyone for a guide number?
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