Last year I bought a pair of almost scrap headlight, from a right hand drive car (I live in Hungary, and you can't use rhd lamps here... so it was very cheap). The lamps were oxidised beyond imaginaition, but the "glass" part was not broken nor scratched harshly, so I bought them for around 10pounds. Then I bought a pair of aftermarket bi-xenon projectors, that fit H4 housings, and use H1 bulbs (for around 60pounds). I also used some black paint, masking tape and gasket maker for glue.
First I sanded and polished the matted headlights back to factory transparency. Then baked the headlight, and took the lens off the body, I painted some parts of the headlight housing matte black (should have done gloss black). Then just "legod" the thing together, the adaptor for the projector went on as the h4 bulbs used to. Glued the lens back on, with black gasket maker.
This whole thing could have been done in one day, well I did it in around a year 
When I first installed it, I used a wrong kind of glue, and the heat melted it. Then I bought an mx-5 which had an MOT due in 3months, so I couldn't work on the Micra for this time. then another glued part gave in, so I had totake them apart again.
Now I use them with h1 led bulbs, it gives significantly more light then the stock reflector halogens did. But just for the brightness it wasn't worth the fuss...... BUT!!! since it is a bi-led setup, the beam pattern is amazingly satisfying, and when you hit the high beams ??? it's like you are sitting in a modern luxury car ? This was one of the most useful mods that I have ever done to a car. If using the right glue, and techniques, it is an easy and cheap mod. I highly advise anyone who tries this, to have a spare headlight, if your glues gives in too, and you can't redo it immediately.
On the night photo I was using halogens, whilst on the others the leds were installed(they are white to the eye, not blue like on the pictures)
BTW a set of spider led fogs are on their way to finish up the front end of the little city-go-er.
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