Most people feel that LED lighting is the future of the film industry for a couple of reasons. Arri seems to think so too and has released a new generation of lights, the L- series, which contains LED Fresnel lighting fixtures.
Arri is really proud of this line. After using one, I think they should be! They have done their best to make sure that these LED lights are as close as possible to traditional Fresnel fixtures in both function and performance.