It's been done years ago if you search for HID. 
It's really old tech now LEDs is the way to go, although HID is cheaper. Also be aware recent MOT changes mean HID or LEDs bulbs won't pass or should be failed as they're not compatible with OE halogen reflector see here https://foc-u.co.uk/index.php?topic=26678.0 So you'll have to take them out at MOT.
If you do fit HID make sure they're the type that are made for a reflector look here https://www.hids4u.co.uk/H1-HIDS4U-Steal...n-Kit.html they also do H4. Many HID kits don't have reflector bulbs and they'll dazzle on coming traffic. Same applies to cheaper LEDs good ones allow for rotation of the chip holder so it matches a halogen bulb and the reflector again stopping dazzle. You may well also need resistors.
Or you're going to have to fit protector lens units or another complete lens unit, in which case the existing halogen unit hasn't been adapted i.e had HID/LED bulbs fitted.
It's really old tech now LEDs is the way to go, although HID is cheaper. Also be aware recent MOT changes mean HID or LEDs bulbs won't pass or should be failed as they're not compatible with OE halogen reflector see here https://foc-u.co.uk/index.php?topic=26678.0 So you'll have to take them out at MOT.
If you do fit HID make sure they're the type that are made for a reflector look here https://www.hids4u.co.uk/H1-HIDS4U-Steal...n-Kit.html they also do H4. Many HID kits don't have reflector bulbs and they'll dazzle on coming traffic. Same applies to cheaper LEDs good ones allow for rotation of the chip holder so it matches a halogen bulb and the reflector again stopping dazzle. You may well also need resistors.
Or you're going to have to fit protector lens units or another complete lens unit, in which case the existing halogen unit hasn't been adapted i.e had HID/LED bulbs fitted.
Later