Interesting comment from Doug;
can be thrown into all directions by the reflector
However, tests in a real world situation have proved this wrong. The reason why some led headlight bulbs work and others don't is because the lens pattern produced by the reflector or lens relies on where the light source originates. Providing this light source remains the same, the beam pattern will remain the same.
I think this explains it better.
Blatting in the lap of luxury
That's pretty good, thanks.
He's a bit woolly on "focus" and "hot spots".
My VW transporter uses H4 bulbs and the headlight design is absolutely dire - I'd be better off using two bicycle LED lights!
There are multiple upgrade paths one of which is to use the lights from a Caravelle / California which have twin H7 bulbs - one for dipped and one for main. The Canbus can be programmed to have them both on for main beam (usually only 1)
LED bulbs are another option on the Transporter but the canbus system is very sensitive, often causing a bulb out warning so an extra 'cheat' device is needed. Packaging all of this into the headlight unit is a challenge without jamming the motorised adjuster!
I just fitted some Osram night breakers which have made a difference and a bargain at £21 a pair.
Retro fitting VW LED lights is £1500- £2000 by the time the self levelling gubbins is fitted :-0
Yes, that's my understanding too. This article points out why it's important to have LEDs the same size as the filament, and in the same position. It also explains hot-spots and cut-offs well.
AIUI, the Gemzoe bulbs do exactly that.
Check out classic Led,they supply E marked bulb. I replaced the Bulbs in my T5 Transporter and didn't have any canbus error problems. The originals were not much better than candles. The new bulbs transformed my headlights.
That's the article I was looking for yesterday but couldn't find it.