Howdy folks,
I just did the H4 bulb upgrade to my st13 using Osram silverstar 2's ($25ish from ebay via the uk -
http://www.ebay.com.au/itm/OSRAM-H4-SILVERSTAR-2-0-TWIN-PACK-CHEVROLET-CRUZE-J300-2-0-CDI-05-09-/171454387381? ), and thought I'd upload a few piccies.
I didn't use shims, (just trimmed the 2 tangs) and the focus and cutoff was exactly the same as stock. The camera was tripod mounted, and fixed exposure time.
First I changed the right bulb and took some photos to compare the two (each photo was takes with a piece of ply over the opposite headlight).
45W low beam
55W low beam
45W high beam
60W high beam
After all of that the standard position lights looks a bit yellow, so white leds to the rescue :-) The ones I bought from ebay (
http://www.ebay.com.au/itm/High-Quality-T10-2835-24SMD-LED-Car-Canbus-Error-Free-Wedge-White-Light-Bulb-New-/251703083213? ) overheated something horrible so I modified them to draw less power. At 14v they drew 4w and started smelling like overloaded electronics. After the modification (replacing the 120ohm resistors with 680ohm ones-good thing I used to do a lot of surface mount electronics) they drew 1w and stayed cool.
I managed to fit them with the fairing on (what a pain to fit, and now I have a T10 bulb somewhere in the fairing
)
The H4 upgrade is definitely worth it, quite a bit more light (and whiter at that) for less than 1/2 an hour of work
Bulb life will be slightly shorter then stock H4s, but if you want really good bulb life use something like osram ultralifes - I run the H7 version in with wife's diesel car and they have done 45,000km so far (vs 15,000k for stock bulbs) - update, just blew @ 60,000km