At night I will run the 400 to 800 lum light. I have used it enough to know it will work great for the TDR. It simply does not have enough output at slow speed for true singletrack riding but for the TDR it will be perfect. Just plug and go, no muss nor fuss. I will supplement the dynamo driven headlight with a rechargeable helmet light.
can be used to charge my I Phone or run the GPS at night.
The USB charger, cabling and catch battery are velcroed to one side of the tank bag and tucked behind a piece of windscreen. Any connectors I need to access/switch are easily reached without unloading the bag