I totally agree with you about the Halogens, nay all Halogens. They are hopeless IMO. I don't think their illumination has decreased with the fitting of rear LEDs. They were just as ineffective before.
I have now sourced a brilliant German ebay seller, Tuning-Fanatics, who are not averse to discounting their discounts! I told them we were very poor in the UK! The others German sellers were hopeless and too expensive.
I have also managed to obtain every part number, right up to the smallest part, for a complete Bi-Xenon fitting. It was a labour of love.
What has put a spanner in the works is the BW45 LED Xenon combination.
I also now prefer the GTi Xenons to the all black R ones.
Never again will I buy a car without Xenons!