That's Nu Lite, which is described in detail in his patent, US Pat. 6984612
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6984612.PN.&OS=PN/6984612&RS=PN/6984612

He describes the use of sandpaper or abrasives, which will remove the (admittedly worn) surface protection of the lens. Then he uses the equivalent varnish or urethane paint. The results should match the photographs; however this finish could quickly erode, leaving a hazed lens with no surface protection.

This stripped off surface coating has also been a problem with all Joey mods which involve abrasives or polishes. Do not use abrasives on headlight lenses if you can avoid it.

A preliminary experiment with acrylic floor wax (Future) yields good results on headlights, and excellent results on VW side markers, turning old white side markers to clear. I'm not sure how long the acrylic wax lasts, but it shouldn't adversely affect the existing lens finish.

So my approach (other than the "Bosch E-code with glass lens" mod) is
to try the acrylic wax. Another alternatives are sending in $5 to get the 303 Products stuff to try their stuff out:
http://www.303products.com/main.php?infopage=freesample
(note: Not only don't I have any affiliation with them, but I have no idea if their stuff even works!)

Like I suggested above, on my car, I'd stick with whatever is cheapest and then get glass lens E-codes, preferably whatever is OEM for MBZ. (I had e-codes since about '79, and since '81 on my MBZ.) Oh yes.. you'd have to do some sheet metal work to get those MBZ E-Codes on a Honda! But there are almost as many aftermarket E-Code lights for Hondas as are made for VW. Don't forget to get her a set of smoked Alteza taillights etc., etc., etc.

- stan
'00 Golf TDI
81 W123 240D/300Dt 5 speed