It is actually illegal to have higher wattage bulbs higher than 55w or 60/55w in vehicles after the age of april 1986 unless they are used in spot/fog lamps or are used off road. As the 9005/9006 was a late type modified halogen bulb introduced in the early 90's, any form of this bulb in a higher wattage would therefore be illegal if used on the roads.
It is also illegal to have these higher wattage bulbs in spot lamps or fog lamps in vehicles after 1991 if they are to be used on the roads. Thats why "brilliance" or "xenon" bulbs came out cos they keep the wattage the same but by changing the gas inside the bulb from halogen to xenon then they get 30% brighter cos when you put an electrical charge through xenon gas it glows a lot whiter, crisper.
As long as the bulb is "e" marked then it has been classed as legal for road use. You could either risk getting a producer by the police or your car could fail the mot by fitting something else. But you run the risk yourselves.
Oh yeah, another point to remember from higher wattage bulbs is that they will draw a lot more current. We fitted some into an early honda civic & the idle speed of the engine actually halved cos the bulbs were drawing so much power from the alternator, the engine was having to work harder to drive the alternator to produce more power. Also the lenses got quite hot. I could feel the heat from the lamps just by standing next 2 them! On certain vehicles, wiring, fuses & the headlamp relay may need uprating as well to cope with the extra load depending on the type of bulb used.
I hope this was of some help
------------- You can never have 2 many gadgets in your car................Now where's that 120A alternator gone? <<<<scratches chin.
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