petak
Enthusiast
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- Vodice, Croatia
Thank you retrospecparts.....my mistake for not pointing out that links are just to show difference in two bulbs.....Believe that in Lithuania are car parts shops were bulbs can be bought much cheaper.
Mr-reno-139....have those adapters for "normal" H4 bulbs with P43t base but had to adapt them to fit my headlights, and spotted small "problem"
As you put adapters, that are 3-4mm thick, then focus of the bulb is 3-4mm out of headlight lens focus and you have big round black spot in center of illuminated part of road.
That is why H5 bulb (H4 bulb with P45t base) is better solution....still adapters can work if you are not driving to much in the dark
Here is one internet photo of different bases,
View attachment 16414
In addition to my previous post and center of the focus in headlight will put few pictures to see what i was talking about.
I have bought adapters for H4 bulbs (P43t base) to fit R4 headlights.
Adapters look like this.

Adapter with H4 bulb and P43t base


And with them you get this kind of illumination on the road

You can see two big black spots in the middle of lights.
Here is illumination made by H4 bulb with round base (p45t)

Spot the differance....
Hope this info is helpful.