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First, the IPD relay helps protect your car's wiring and lessens voltage drop, so that the bulbs will receive higher current and glow brighter. They do not, on their own, really help (IMHO, and despite what others may write) because they don't deal with the basic shortcomings of the lousy optical design of the headlights. The only useful improvement is from the accidental "spillover" simply because of a greater flow of photons.
On the other hand, if you put higher than normal (55/60W) H4 bulbs in the Euroheadlights (see below), relays will contribute to better illumination. However, Euroheadlights with even standard wattage is so much better, you may not feel the need for higher wattage, and the relays, once you have the Euroheadlights.
That said, let's talk about obtaining Euroheadlights. You can go cheap (and that's only relative, because they're still expensive) or expensive (and that's more so). Two sources that I know about (others can add other names):
1) This guy's name is Bram Smits, bram@fangorn.xs4all.nl, and his website is
http://www.buvic.com/car/forsale/lights/index.html
He sells the cheaper "Scantech" quality headlights. I bought a pair (for one of my '93's, from him); he's trustworthy, and ships fast.
2) This guy's name is Soren Johansen, soren.hee@mail.dk, and his website is
http://www.sitecenter.dk/classicvolvoshop/h4euroheadlights/
He sells the more expensive genuine Volvo-brand, Cibie-made, OEM european headlights, and I'm planning to order a set from him for my other '93 240 when I've finished paying off christmas shopping (I didn't like the lack of quality of the more affordable Scantech-made headlights).
And in addition, there have been some posts about fabricating the installation of "sealed" beams (meant to substitute with Cibies) -- you can find them on the archives -- none are easy, and as I reported before; some look very good (close to OEM), and some look ugly. But they are all a vast improvement, functionally speaking.
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