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Other than halogen lamps, LEDs are highly effective even at low power, i.e. when run below the nominal power/ its rated capacity. This is the reason why dynamos no longer need to be build in a way for them to reach full power at the lowest possible speed. Therefore, SONdelux is smaller and lighter than a hub dynamo for halogen lighting (SON 28).
No-load power input drops by about 30 - 35% compared to SON 28. But SONdelux equals SON 28 concerning durability and outstanding quality.
Unfortunately includes only the SON28 and SON20 and not the SONdelux.
systematic and random measurement errors
Looks like an interesting project.
Camping very close to Seattle accessible on bike with little kids!