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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Lightray Diffuser & Cosine Corrector accessory

One Accessory, Many Benefits

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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.

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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.

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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 and iPad.

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.

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Introductory Price

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Worldwide shipping and tax included*
Compatible to all newer iPhones and iPads** Not compatible to Android devices** Currently only compatible to iPhone and iPad**

* We ship with DHL Warenpost International Premium and cover all taxes and duties in most countries. Check for details here.

** Compatible to all newer iPhones and iPads. Not compatible to Android devices. See all compatible devices here.


Shipping Details

Your order will leave the warehouse within one business day after a successful payment.
Shipping is handled with the fastest method available to us using DHL Warenpost International Premium, which also includes parcel tracking. Typically, your local postal service (e.g. USPS, Correos, …) will handle the final delivery.

Your order will be shipped from Germany by our logistics partner Omnitrade e-commerce GmbH.
Expected delivery times vary by region:

  • North America: 6–10 days
  • Europe: 1–5 days
  • Asia: 6–12 days
  • Africa: 6–18 days
  • Oceania: 12–18 days
  • South America: 16–20 days

Taxes and Duties

For most countries, all taxes and import duties are paid in advance by us. The only exceptions are Brazil, Portugal, Iceland, Nigeria, Turkey, Russia, Serbia, Slovenia, and Albania where additional costs may be charged upon receipt of the package.

Device Compatibility

Before purchasing or diving into the details of using your new diffuser accessory, it's crucial to confirm that your device is compatible.

Apple Logo iOS (Apple)

iPhone: All models starting from the iPhone 5S (2013) onwards
iPad: All models released after 2013

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

Not supported yet! We are diligently working to extend support for Android users. Your patience and understanding are greatly appreciated as we work towards this goal.