EDITORS NOTE, JUNE-2019: A contact from Isomi reached out to be asking for a couple updates to this blog post. See quotation below:

Would it be possible to update the first paragraph? Isomi isn’t a spinoff of Paul Crofts Studio, it was founded by Nick Welsh, Jenny Davies and Paul Crofts. Nick and Jenny had been at the forefront of the solid surface industry for 20 years when they met Paul, they had a shared recognition that the market was missing design-led, easy to specify furniture which led to the conception of Isomi. Since your article was written Isomi has introduced new materials (concrete, brass, copper and hot rolled steel) and no longer just focusses on solid surface. As Isomi doesn’t exclusively use Krion, could you remove that part from the first paragraph. Light Wall is backlit by an LED lighting box, supplied with a remote which also controls the intensity of the LEDs as well as turning them on and off. Could you also please add image credits to Annabel Elston for all of the images used. We also have a new video (https://isomi.com/about) if you wanted to update that as well.

A modular luminous wall panel design from London-based Isomi.  Isomi appears to be a spinoff of Paul Crofts Studio that is focused on fabrication using the Krion solid surface material from Spanish manufacturer Porcelanosa.

No information on the light source but I would assume LED sign-box lighting is used.  According to their site:

Available as a freestanding screen or fixed wall cladding, Light Wall can be customised with a variety of translucent patterns, with additional options including your company name, logo or message. Produced in solid surface as a range of standard components for ease of specification and installation, Light Wall can be fitted in a variety of shapes and sizes, for both permanent and temporary use.

Spec sheet for posterity is here: Isomi Light Wall Spec

And here is a video of the designer talking about their fabrication processes: