iPads are LED backlit (I think), in any case, the white light that the iPad emits is a very, like higher than 5k Kelvin. That’s a “white” light. Stage lighting and TV Studio lighting uses a warmer 3k Kelvin that is more of an Amber color. Tungstun lighting even grows more Amber the more it is dimmed with lighting controled dimmers.
When you put an iPad in front of your face it is going to wash your face and clothes with this “white” light and make you look weird and cold.
IF you set your background to something other than the default white you can force the white of the page to emit a warmer color of light “Choir PInk” is a lighting gel color name, anything Pinkish or Amberish will warm up your appearance. Especially if you are older.
Make your iPad cast kind lighting , and don’t have them any brighter than you need for a specific gig. If it’s dark, try turning the brightness down a bit. It will help make you look better to the audience and you can’t even see the audience if your iPad is too bright. Less is more.
Have fun.
Eventually, Strum Machine will have “dark mode” support, and this will make the screen emit much less light in situations like these.
In the meantime, and as an interim alternative to dark mode, the iPad has some handy features under Settings > Accessibility > Display & Text Size that can be useful. The best is Invert (either Smart Invert or Classic Invert) which will invert the entire screen, turning a mostly-light screen into a mostly-dark screen. There are also interesting options under Color Filters to adjust the overall color of the screen, e.g. to put a red filter across everything. As of iOS 18 you can add a toggle for any of these settings to the iPad’s Control Center.
Do a very fast triple-click on the right button on an iPhone and it flips into night vision mode with all red tones. It is useful for backyard astronomy. I wonder if this same feature is on an iPad.
iPads and iPhones both have the capability, but it must be set up through Settings > Accessibility. (Triple-click is toggling the Color Filters accessibility feature in your case, I believe.)