Well, the new 3000 Lumen LED driving lights showed up today, and I'm here to tell you, LED lights have gone nuclear!
I connected one of them to a small portable jump starter I have, and lit up the tree tops of the big Fir trees around my property (it was raining, so no fires were started with them). I still need to get them out on the road where the illumination distance can be checked out in a more realistic scenario, but one of them had no problem lighting things up 300 to 400 feet out. The beam appears to be a dual focus of intense spot light that gets way out there, and a more localized flood light around the spot. The T6 LED is rated at 6000K, so it's a very white light.
They are small, as you can see in the attached pics. They are also much heavier than I expected, based on their physical size. They weigh in at 1/2 lb each (just under 8oz).
Thanks to Armyguns for the link for his dimmer circuit (
http://www.zggtr.org/index.php?topic=207.msg28222#msg28222), and the LED dimmer module (
http://www.printerdoctor.com/leddimmer.htm). I was going to make my own, but for $14, it's hardly worth the trouble. These lights are rated at 2.5amps at 12VDC (each), and the dimmer is rated for 8 amps max.
The fourth attachment is a 1 page flyer on the lights, that the seller emailed to me a couple days after I ordered them. They came in from China, but with a USPS tracking number, so there were no surprises. It took about 2 weeks to get them.