I have three sets of extra lights on my 1150GS - a set of 7" HID spots (have no source for them) - a set of Rigid Industries Duallys floods wired into the main beam (see
https://www.bikevis.com/product-category/motorcycle-auxiliary-lights/) which are very well made: together they really do turn night into day.
For spots running all the time with the dipped beam I have a set of Cree U5 LEDs (lots on eBay - like these:
http://www.ebay.co.uk/itm/2pcs-125W...245217?hash=item5d69846e61:g:uJIAAOSw8gVX93J0) - for the price they are very good and much better than a lot of more expensive lights (including a set of PIAA lights I replaced them with). Just need to untwist the bulb and remove the U2 chip to stop them flashing - videos of this on Youtube. Bright enough that you need to be careful how you aim them!
Hope that helps.