Hi Danny
Xenon HID (High Intensity Discharge) lamps work through with an igniter and specific D type bulbs.
They also utilise vehicle height adjuster sensors which alter the headlight beam level to avoid dazzling other motorists when the vehicle changes pitch or load.
These cannot easily be fitted to the vehicle retrospectively.
However, you could possibly fit later Xenon style headlamps but fit your standard Halogen bulbs into them.
Also, an upgrade on the bulbs to a higher output intensity (as in link below)
https://www.halfords.com/motoring/bulbs/h4-472-car-headlight-bulb-halfords-advanced-white4000-single-pack-719314.html