What I've done is fit a pair of 27W (9x3W) LED units, each of which puts out at least the lumens of the halogen main beam, but at half the current demand, thus giving the charging system an easier time if used singly, or as a pair aren't taking more than the standard bulb.
These are fine if switched in/out as a substitute pair for the main (halogen) beam on the dark back roads, but I have to use the standard halogen dip beam as the LED units have very poor low beam cut-off; even when slanted down, there's still too much scatter upwards and that's dazzling to other drivers.
There are some aftermarket LED complete headlamp units, but most of the cheapies from China seem to simply switch in/out extra smaller 3W LEDs to accomplish main/dip and on close examination don't look as if there's much (if at all) in the way of headlamp optics to control dip-beam scatter.
The other way would be to track down who makes the latest Harley-Davidson LED headlight unit as that seems to have tackled the job properly, but it's expensive.
Seriously, I just can't justify that much for a headlamp. It would have to create a shield of impenetrability around me to warrant the price.

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