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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.

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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.

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

ProfessionalRing Light

We build user-friendly and affordable mobile apps, so that anyone can experience precise and effortless light measurements.

2015 - November/December2015 - September/October2015 - July/August2015 - May/June2015 - March/April2015 - January/February

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

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

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Many common Android devices are supported, but unfortunately not all of them. Please check the list of all 188 compatible devices for yours.

Ring LightSoftbox

Light Lines is the Society’s bi-monthly magazine. It includes carefully curated content on an array of different lighting topics, from ongoing research projects to industry awards, competitions, and events.

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 **

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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.

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.

18 inchRing Light

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.

2016 - November/December2016 - September/October2016 - July/August2016 - May/June2016 - March/April2016 - January/February

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.

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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.

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.

Light Lines is edited by Jill Entwistle, with features contributed by members of the lighting community, SLL committees and staff.

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