Transform Your Smartphone Camera Into a Professional Light Meter

The Diffuser & Cosine Corrector accessory enables your smartphone to measure light at top-level accuracy without any compromises.

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One Accessory, Many Benefits

Best-In-Class Accuracy

Forget flimsy, inaccurate light meters. With the diffuser attachment, you'll get professional-grade measurement accuracy from your smartphone. Rivaling expensive hardware meters at a fraction of the cost.

Excellent Cosine Correction

The accessory's sophisticated design provides your smartphone light meter with an ideal directional response. This leads to accurate measurement results in real-world scenarios where light strikes from different directions.

Premium Quality

The Diffuser & Cosine Corrector accessory was developed and tested in a Swiss optics laboratory. Every piece shipped is hand-assembled and has passed strict quality control.

What You Get

With the Lightray Diffuser & Cosine Corrector accessory, you'll get a clip-on diffuser that attaches on your device's front camera. It is tested and designed to work with every iPhone, iPad, and many Android devices.

A Lightray app with a Diffuser & Cosine Corrector attached

How It Works

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

Assembly of the Lightray Diffuser & Cosine Corrector accessory

Even further, the mechanical assembly allows the accessory to act as a Cosine Corrector, enabling light to hit from any direction without causing measurement errors.

Ideal cosine correction with the Lightray Diffuser & Cosine Corrector accessory

Developed and perfected by a team of Swiss optics experts and researchers at Zurich University of Applied Sciences, the Diffuser & Cosine Corrector accessory provides you with professional-grade results. It was rigorously tested in an optical laboratory with a wide number of devices to perfect a smartphone's light measurement capabilities.

Lightray Diffuser & Cosine Corrector accessory

Combined with one of our apps it meets international light measurement standards as described in ISO/CIE 19476. Every piece manufactured is assembled by hand and is required to pass a strict quality control. Our technology is patent pending under US 63/463,568 and US 18/820,817.

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Where should we ship your order?

$39

$32

Promotional Price

Orders are handled through Amazon* Worldwide shipping and tax included*
Compatible with all newer iPhones and iPads** Limited compatibility to Android devices** Compatible with iPhone, iPad, and many Android devices** Compatible with your **

** Compatible with all newer iPhones and iPads, and many common Android devices. See all compatible devices here.

Transform Your Smartphone Camera Into a Professional Light Meter

One Accessory, Many Benefits

Best-In-Class Accuracy

Excellent Cosine Correction

Premium Quality

What You Get

How It Works

Order Yours Today

Shipping Details

Taxes and Duties

Device Compatibility

iOS (Apple)

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