xenons

Hi all, first off new to this forum and to the world of Astra. Just bought a 2012 CDTi Elite from a friend for a winter commute (i normally ride a motorbike), but i noticed that the stock headlights are pretty poor, since most my driving will be at night down dodgy country lanes this is not...

Anyone know what can be done to improve the headlights on a standard Astra H? 57 plate? Mine are the normal halogens and ive come to realise how poor they are when driving at night! Can i just buy Xenon bulbs and fit them straight in or is ther more to it than that?