For trail lighting you need better lighting then road riding due to the imperfections that need to be seen. Usually the best way to handle trail lighting is using two lights, one on the bars and one on the helmet for a different lighting angle. Sadly this won't be cheap. Problem with cheap Chinese knockoff lights that seem like a good deal is that they don't put out anywhere near as much lumens as they report. A friend of mine has a 1200 lumen Magicshine and my 480 Lumen Cygolite Mitycross was actually brighter, it threw out a beam further but the MS had a slightly wider beam, overlay the two and the MityCross washed out the MS beam; in addition the Cygolite battery had a longer run time. You get what you pay for with those generic jobs.

I think you could do well with two Cygolite ExpiliOn 410's or if you can swing it two Expilion 500's. The combine cost for two 410's would be about $200 and give you a total of 820 lumens, the 500 would cost you about $280 and get you 1000 lumens. The cool thing about these lights is there is no separate battery to run a wire to, and the battery is rechargeable and replaceable which means you could carry another set of batteries with you if need be. They come with bar and helmet mounts that require no tools. They also use regulated power which gives a flat consistent power output vs the cheap ones that don't do this which will result in a slow decrease in lighting output.

Just another thought.