Look for threads by 'BTBR' and 'Les Wessle' these guys are the current specialists and can probably answer most of your questions.
You could also look on this website for some very well priced lights www.blinglights.com
I just happen to have asked a couple of lighting questions of my local BW dealer just yesterday.
BW can supply a plug in loom and switch for a single set of lights (same as fitted to the GSA) but it's likely you'll have to get the bike plugged into the diagnostic to make adjustments of the Can-Bus system.
Not sure how it would be affected by fitting a second set of lights.
The alternator has a total output of 600 watts on the 1200.
BW can supply a plug in loom and switch for a single set of lights (same as fitted to the GSA) but it's likely you'll have to get the bike plugged into the diagnostic to make adjustments of the Can-Bus system.
Not sure how it would be affected by fitting a second set of lights.