screen vs Screen Light Color

This is the simple white & black screen. You can get soft and small illumination. With white/black slider With brightness slider

Turn your iPhone or iPad into a clean, full-screen color light. Pick any color, adjust the brightness, then hide the controls so the display becomes the light — with nothing else in the way. Screen Light Color is useful as: → A studio light for accent or soft fill lighting → A lightbox / light table for tracing, drawing, animation, film negatives, radiographs, and more → A color reference and matching tool → A night light or screen flashlight → A red light for stargazing, night walks, or darkroom use → A beacon, visual signal, or mood light Made to stay out of your way: → Open colors from Home Screen widgets or Control Center → Use Siri and Shortcuts to open the app and set colors → Use Split View and multiple windows on iPad, each with its own color → Temporarily disable touch to prevent accidental taps or palm input → Use custom in-app screen brightness without changing your device brightness elsewhere → Navigate the app with VoiceOver Want more control? An optional in-app purchase unlocks: → Precision white-balance controls for warmer or cooler light, including magenta/green tint → Hue, saturation, brightness, RGB, and HEX controls → Saving as many custom color swatches as you want → Sync saved colors across your devices with iCloud → External-display support, so you can turn a TV or connected display into a larger light panel using AirPlay or a cable Simple when you want it. Precise when you need it.