I have had this conversation before on Piston Heads. There is no maximum wattage level on main, dipped or spot lights in the UK only a minimum level.
The bulbs are illegal, end of.
Bulbs fitted to any vehicle first put into service on UK roads since 1/4/86 must be compliant with ECE Regulation 37 (in the case of filament lamps) or Regulation 99 (in the case of Xenon lamps), which stipulate the power (wattage) and output (lumens) for each permitted bulb type. There is no blanket wattage limit; maximum allowable power consumption varies by bulb type and nominal design voltage, but in no case are 100W bulbs permitted.
Bulbs must carry appropriate markings of conformity to demonstrate compliance with the above regulations and it is illegal to use any bulb which does not do so on the public highway. If you do, and you have an accident which could in any way be attributable to the bulbs, your insurer would be within their rights to invalidate your insurance and recover all third party costs from you.
Do not be deceived into thinking your car is compliant with the regulations just because it passes an MOT test.
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