Balloon lights are an uncommon light source for most of us. But such lights are often used in TV and movie production. They’re essentially huge light sources that are overhead of your subjects using very bright bulbs. The balloon part of it acts like a big diffuser to help soften and spread the light out more evenly. They’re not cheap, though.
But this DIY option from Todd Blankenship at Shutterstock shows us a way to make one fairly easily using some shower curtains, LED strips and helium.