Here's an overview of the new F&V K4000 LED Studio Light Panels along with a few samples at the end showing how it compares to a common ARRI 650W Fresnel. The unique offset filter mount on the K4000s allow better diffusion and eliminates multi-shadow issues that are common with LED lights.
(above) Offset Milk Diffusion Filter
Description: A lightweight and portable studio solution, integrating our newest technology in synchronous lighting, expandability, and power LEDs. The perfect mobile studio lighting solution. Available in daylight and bi-color models. The new K4000 Daylight Studio Panel light sports 400 pure color power LEDs, offering 2860 Lux @ 1 meter in a self-contained 1'x1' unit. Carefully selected LEDs are put through multiple tests and evaluations to ensure perfect color balance and diode matching. This offers an absolute pure color consistency between LEDs, and a clean daylight calibrated color (5600K).
The K4000 LED panels are also available in Bi-Color for adjustable color temperature from 3200K-5600K. Individually these lights are more expensive than the common 600, 900, or 1200 LED panels but the 3 Piece Studio Kit (found here) that includes a nice travel bag brings them down to about $330/each. Additional Specs, Highlights, and Package Contents for the K4000 LED Video lights can be found at http://fvlighting.com (click here to visit)
K4000 Single Color / K4000S Bi-Color LED Video Light Kits