We have supplied our Nu World LED Light Panels as backlighting for countertops, backsplashes and vertical wall pieces many times and I am confident that we can work with you to find a great solution for your project. Below is a little info about this product and application:

Nu World LED Light panels are versatile, low profile light source that allows for the placement of light in spaces that are too small to house traditional lighting products. We manufacture our LED panels in virtually any shape or size. Our advanced CNC capabilities allow us to supply the LED panels with voids for kitchen sinks or basins as well as holes for plumbing or electrical. We work closely with Designers to ensure that the correct product is utilized in their application and we provide custom drawings on a project by project basis

6 main reasons to our product:
Trusted by top end clients including The Trump Organization and Dennis Washington as well as McCarran, Los Angeles and Vancouver International Airports
Products tried, tested and installed in the North American market for 8 years
Virtually any shape and size -Fully customizable
Ultra-Thin Cut voids where needed (sinks, taps etc.)
Virtually no maintenance over the life of the LED Light panel
No UV and virtually no heat (perfect for light and heat sensitive exhibits and displays)

We specialize in backlit surface materials like Onyx, Corian, 3Form, Glass2 and Concetto to name a few

Go check out our website for more info

http://www.nu-wo.com/backlit-onyx