
Originally Posted by
Diesel_vert
Yes you can, as fitting high wattage bulbs is not illegal.
However, it will render the vehicle unroadworthy - i.e. unfit for use on the public highway.
A more bigger concern would be the possibility of a 80W, 90W or 100W halogen bulb causing damage to the headlamp housing (especially to any plastic components) and the wiring assembly, due to the bulb's current draw and heat output.
AFAIK, no automotive halogen bulb with a rated wattage of 100 that I'm aware of is approved for use on the highway.
A blue coating by itself only acts to reduce total light output.
Gas-discharge bulbs, also known as high intensity discharge bulbs, are usually filled with noble gases, such as xenon.
Halogen bulbs are usually filled with halogen gases (hence the name), such as iodine or bromide. But in addition, they are sometimes also filled with noble gases as well, such as xenon.
The "plus" ratings used by the manufacturers refer to the amount of light on the road measured at a distance between 50 m to 100 m (I think) from the vehicle. These higher plus ratings are mostly achieved by using a thinner filament and using a more advanced gas filling, allowing the bulb to burn hotter and brighter - which also has a negative impact on life span.
The actual luminous flux rating (total light output, measured in lumens) doesn't change much, or at least, there is certainly not a 50%, 80% or 100% increase in luminous flux - unless light bulbs aren't subject to the laws of physics.
Correct me if I'm wrong, but:
Models with a combined dipped and main beam lens use one dual-filament H4 60/55W bulb per headlamp (Trendline).
Models with a separate dipped and main beam lens use two single-filament H7 55W bulbs per headlamp (Comfortline & GTI).
If your vehicle uses H4 bulbs, consider the Osram 70/65W bulb (product code 64205).
If your vehicle uses H7 bulbs, consider the Osram 65W bulb (product code 64217).
Note that both products would technically render the vehicle unroadworthy, because they don't have a ECE mark, but the chances of getting caught would be very slim.
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