Jonny,
Here is a link to the Salvo site...
Salvo Diving Equipment - Rebel LED Lights
I recently bought a Salvo 21 watt HID. Their customer service etc is awesome. I do have this fear live everyone else that I will bang it against something and the bulb will go. That being said, my salvo 21 watt HID has been great.
The technology is just getting to the point were LEDs will start being the technology to go with. Salvo has actually stopped selling their 10 watt HID because their new 12 watt LED is brighter and a better value.
In the 21 watt area, the HID is a little brighter hence they are keeping it in the product line. I have decided that the 21W LED is the way to go due to the durability, brightness varability, head size and burn time options... When I spoke with Cory at the Salvo booth, he said that one of the things he did to test the light was to just let the light head bounce along on the limestone floor of one of the local caves while clipping along at a good pace on his scooter. None of us would obviously do this with an HID. As soon as we heard this my cave dive buddy "O.C. Diver" on this list, looked at one another and said.... "We will take two"... I am happy to trade off the slight loss of brightness that the 21 Watt HID has for the rest of the benifits. As soon as my new LED shows up I will be selling my HID.
Hope that helps...
Mark