Well my estate has very low wattage LED sidelight lamps (bulbs are placed in the ground and in time give flowers!) and the original sealed beams.
The sidelight lamps are not strictly legal, but I have had no problems yet, but because of their slightly blue hue, I believe they are more easily noticed, much like the daylight running lights fitted on a number of cars now.
They also have the advantage of being low wattage and so less power consuming... this will help the battery if using the parking light facility or just forgetting to switch them off!
The pi on the other hand has halogens, cibies I believe, they were fitted already when I bought the car and without relays. Main beam has never worked as the switch was already burnt out......you fit Halogens without relays at your peril!
It also has the sidelights in the dip beam, these are in conjunction with the existing sidelights and I have to agree with those who have noted the merits of this setup.
Whilst everyone is trying to improve their night vision, spare a thought for your rear lights.
Lamps degrade with time and even a fresh set of stop n tails will brighten your rear end no end.
Saloons with the night time brakelight dimming relay should really have this removed at once, and some industrial foil tape, as used by pipe laggers, can be used to great effect to improve the reflective qualities of the reflector units.
Or alternatively, just stay home if it's dark, raining, foggy or even mildly inclement...........but you'll probably never get to use the car
Colin.