I've just driven my C70 back to North Wales from Telford on the A41, and as well as being constantly blinded by other people's headlights, I felt my lights were inadequate, despite being the whiter-than-normal Nightbreaker bulbs. As Martyn says, it was quite scary. Been looking for crystals for a while but maybe projectors are the way to go - they are more easily obtainable...
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