We, too, in Australia, need to have our headlights on in daylight. I've just replaced my 280w rotor. Long story but I didn't have the time to upgrade as intended in that event.
I do spend a lot of time in traffic & I'm always nervous about the drain caused by the headlight. If I could reduce that, I'd be happier so I'll source a 20w halogen as Barry says above. Thanks for that.
I did add an accessory cable with plug & 10 amp fuse direct from the battery and comes out in the "boot" in the LS. It works fine.