having retrofitted the xenon headlights myself, i really really dont remember there being anything near 5kg difference in the units.
sorry to be unable to quote figures, just from memory i dont remember them being much difference!
and 10kgs.....hmm.....i sh1t that much in the morning, dont get rid of the xenons, they look too cool! ;)
LOL.. Thanks mate. I thought it seemed a lot, im now thinking maybes 5kg for both? Anyways if thats the case I would rather keep the xenons and continue to blind oncoming cars 
haha...comedian in the house! lol
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i was only taking about HID Kits! ;)