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…
From the developer’s store description.