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Yes, no need to get excited about voltage drop if you've got good E-code lighting. It would at best be a small improvement. Clear lenses and unfaded reflector surfaces would probably be even more effective for improving standard lighting.
Another thing to avoid is Long Life (LL) halogens, which many might choose what with our DRLs having the headlamps on full time. They actually consume about the same watts, but generally use a thicker filament to last longer that doesn't give off as many Lumens and produces a bit more yellow light. I know, I had them in for a number of years and didn't realize how poor they were until I had our two 940s side by side in the dark one day.
That Motor pro service wiring diagram manual for 1991 imports looks interesting and the price is certainly right. I see the last one on eBay just sold, so you? The diagrams very much look like they were cribbed out of the Volvo manuals, but I doubt they would want to break copyright. That introduces the possibility for errors, but even the green manuals have the odd error. It doesn't look like it includes component drawings and locations, which can be very helpful, especially for relay locations, connector blocks, ground points and harness routing. I also suspect it's just for North American market cars and USA in particular, and wouldn't cover the many international variants for some of the circuits as does the green manual. I'm sure it would serve your purposes well, but if you've got a choice, keep looking for a green manual, even a 1990 would be extremely useful.
As for the fogs, is there existing wiring to the auxiliary relay socket in the fuse tray? If you need an auxiliary relay then you can check out a genuine Volvo parts dealer website for the parts fiche to get the part number and cross reference that to something commonly available or one of the other relays that's the same to get from a yard. You can also use a rear fog switch instead of a front fog switch, the only difference is one is red and one is orange as I vaguely recall. I'm even wondering if you can piggyback the front fogs on the existing rear switch, but haven't bothered to think about that harder. With a bit of effort you should be able to find a number of yards who will have suitable 700/900 donors that do phone or online ordering, even international shipping.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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