The bulbs are all 55W H7, high beam, low beam and driving lamps. Given the nature of the headlight unit I would strongly advise against any higher wattage bulbe as it is a sealed and very plastic unit, so heat is its enemy. You could also destroy the clear polycarb lens.
I've been looking at the idea of the headlight wiring upgrade, but again, the unit is basically a plug in module, so very hard to do. It is actually a single multiplug to each headlight module (park, indicator, high, low).
As to which bulb of the same rating is best... what ever you think is best.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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