Apple’s new foldable handset, the iPhone Duo, includes a lighting trick that first appeared on Macs in macOS Tahoe 26.2: the Edge Light effect. Designed to enhance video calls, Edge Light turns the borders of the Duo’s screen into a virtual ring light when you’re in a dim environment. It aims to brighten faces evenly without needing external lighting gear.
Edge Light first launched on Macs with Apple silicon (M-series chips) last year. When enabled during video calls—whether in FaceTime or third-party apps—a glowing frame appears around the screen to produce soft, balanced illumination. Users can tweak both the glow’s width and color temperature to make it warmer or cooler. The light also dynamically backs off when your cursor nears the screen edges so it doesn’t interfere with onscreen content.
How Edge Light Works on iPhone Duo
Code in the release candidate of iOS 27 ties Edge Light to a device identifier that corresponds to iPhone Duo, confirming it’s under active development for the foldable. That code suggests Duo will get the same customizable width, brightness, and color-temperature settings seen in the Mac version. However, some features—particularly the color temperature slider—are reportedly not yet finished. It’s not fully clear if Edge Light will be available at launch or arrive via a later update.
Why Duo Is Uniquely Positioned for This Feature
The iPhone Duo’s inner screen measures 7.6 inches, offering a large surface to cast glow around. The under-display front camera means the screen edges are uninterrupted, making for a cleaner virtual lighting effect. And thanks to the foldable design, Duo can be propped or partially folded—ideal for hands-free video calls. All that together makes it a more natural fit for something like Edge Light than a standard slab phone.
Still, using major display illumination comes at a cost: higher power draw and potentially extra heat. Since most of the glow effect lights up white borders at high brightness levels, battery efficiency and thermal throttling will need careful balancing—especially in a thinner foldable device.
Apple has confirmed that the Duo launches on October 23, and pre-orders are underway. Whether Edge Light ships on day one, or gets added in a software update after the Duo is released, remains to be seen.
Edge Light represents a broader trend toward software-based improvements that reduce reliance on hardware accessories. As camera and display tech improve, using the screen itself as a lighting source becomes increasingly viable. For users who take video calls in low light—on Macs or this foldable iPhone—it promises convenience without extra gear. Moving forward, things to watch: how well Duo manages heat and battery demands with Edge Light, whether the feature becomes available on other newer iPhones, and how adjustable its controls will be in practice.
