Blue lights just look brighter - they don't help you see better. In fact if you want to go to coloured lights, yellow would be better, as in France. But I suggest staying with white.
Good quality (clean) headlights is where to start, followed by getting the full voltage to them (see other replies) and only then think about higher wattage bulbs, if more light is still wanted.
Headlight bulbs are very sensitive to voltage, and eliminating even a few tenths of a volt drop can have as much effect as doubling the wattage. Similarly, the difference between good and poor quality headlights can be even more than a 100% change in wattage.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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