I think I have these in the Fabia – glass ‘ball’ inside the headlight unit?
correct, that’s a projector lamp. worth checking your actual car as some manufacturers use them in posh models and basic reflectors in cheaper cars. Projectors are great for pattern, but absorb a bunch of light from the bulb, so halogen-bulbed-projector-housing cars (a lot of vauxhalls) have much worse lighting than old-school holders.
although won’t pass the MOT
they shouldn’t pass an MOT, but frequently do, especially if the car had HID or LED bulbs available in the same housings in posher models (as is normally the case). Mine sail through
some LEDs also trigger the “bulb blown” message on canbus or flicker when not in use (as the car senses whether the bulb is good or not) – I had to buy something like this https://www.philips.co.uk/c-e/au/car-lights/headlights/led-bulbs/led-canbus.html to stop the errors.