Lightray - Light meter accessories for iPhone

Best-in-class accuracy

Forget fiddly, inaccurate light meters. With the diffuser attachment, you get professional-level measurement accuracy with your smartphone. Our solution rivals expensive hardware light meters, but costs only a fraction of the price.

Excellent cosine correction

The ingenious design of the accessory gives your smartphone light meter ideal directional behaviour. This leads to accurate measurement results in real-life situations where light is coming from all directions.

Premium quality

The diffuser & cosine corrector accessory has been developed and tested in a Swiss optics laboratory. Each delivered part is assembled by hand and has passed a strict quality control.

What you get

With the Lightray Diffuser & Cosine Corrector Accessory, you get an attachable diffuser that can be mounted over the front camera of your device. It has been tested and designed to work with any iPhone and iPad.

How it works

The semi-transparent white disc is a perfect diffuser. It consists of a microscopically rough surface created by fine particles and structures embedded in the material. When the light enters the diffuser, it is scattered in many directions and leaves the diffuser in a uniform light. This allows your device to take an accurate light measurement by using the camera as a light sensor.

The diffuser & cosine corrector was developed and perfected by a team of Swiss optics experts and researchers from the Zurich University of Applied Sciences and delivers professional-level results. It has been tested in an optics lab with a variety of devices to perfect the light measurement capabilities of a smartphone.

Device compatibility

Before you buy your new diffuser accessory or dive into the details, make sure your device is compatible.

iOS (Apple)

iPhone: All models from iPhone 5S (2013) onwards

iPad: All models released after 2013

Android (Samsung, Google, Xiaomi, OPPO, etc.)

Not yet supported! We are working diligently to expand support for Android users. We appreciate your patience and understanding as we work towards this goal..