The invention took advantage of the high dielectric constant of ceramic to create a very small waveguide to constrain and focus the radio waves.
Ceravision's invention was a clear quartz waveguide and integrated lamp, which forms a single piece construction.
The generated light can now be collected because the waveguide is optically clear, giving excellent lamp lumens per watt.
The second issue - long life, low cost RF generation has been solved using a combination of a magnetron with a specialized controller.
Magnetrons are manufactured in large volumes for use in microwave ovens and are able to produce RF power at low cost.