I fitted a pair of HID bulbs - the 50 watt ones from one of the eBay suppliers. they are Brilliant! I've got them in the Wipac clear lens headlamps - total cost about 110 pounds sterling for lamps and bulbs, and they really throw a great light. they also have a cunning 'flash' built in, so when you just flash to let someone out of a junction for example, they are REALLY bright for a 10th of a second, like a camera flash being fired - impressive!

I'd been trying to improve my lights for a while, working through 130 watt halogens etc - out in rural Ireland there are deer and dog walkers all over the place, plus the odd unlit tractor still, never mind getting to N Africa for surprises at night, so good lights were a bit essential...

Get the 'normal' light temperature type though - don't bother with the more popular 'blue' temperature type, I think mine were 5400k, that's already a lot 'whiter' than halogens, anything more blue would just be silly...

As a strange extra, the temp gauge on our Defender used to keep suddenly going off into the red when the headlights were on - fitting the HIDs solved that after a year of changing temp senders, replacing wiring and generally banging my head on the dashboard on a regular basis... (temp was always fine, but the gauge would go up after running with headlights on for a bit, until I pushed in the cigarette lighter, then it would return to normal - ah, LandRovers...)