I am looking for a minimum of 40Watts, that can be mounted onto my camera using an accessory shoe. It must also be battery powered from a dedicated source, and not my camera battery.

What is available to me in the UK? My budget is pretty tight also!

Many thanks.

How about this thread (http://www.dvinfo.net/conf/photon-management/235221-comer-camera-led-lights.html)?

Comer 900 LED light is on camera, less expensive, use Sony or Panasonic battery, and great output.