I think that there are a few of you here that need to get a book and learn about Ohms Law and a few other electrical principles.
Power (Wattage) = I (current in Amps) X E (Voltage). If you put in bulbs that consume more Power, the Voltage remains virtually the same, so the Current(Amps) will increase. Connectors, wiring, relays, sockets and all electrical components are selected and installed in your car with a rated Current(Amperage) in mind. If you increase this current, these electrical components will not be capable of dealing with the added current.
If the Current increases too much, heat is generated wherever the most resistance in the circuit exists. This is usually at a connector, relay contact, switch, etc.
When you make modifications to a car, you are always doing so at your own risk. When the car is under warranty, you are transferring that risk unfairly to the business that, in good faith, agreed to warrant the product at their expense. Some modifications have no ill effect, others do.
If you are not totally knowledgable regarding any possible ill effects that may be caused by a modification, it is not fair to impose this risk on the entity that is providing the free warranty service. This is just common human decency. If it turns out that the modification causes expense to the warranting entity, paying for that repair would be the decent thing to do.
When I first got out of the Army in 1971, I worked for a short time at a Dodge Truck shop. This was in the days of the Chrysler 50,000 mile drivetrain warranties. It amazed me to see how many trucks came in with 49,000 miles on the odometer, and completely WORN OUT! Some of them didn't even have enough pride to reconnect the speedometer cable themselves before they drove it into the shop expecting a new engine or transmission for free.
I have heard the term "Consumer Protection." What about protection FROM the consumer? Any transaction is a two way street and deserves fairness from both parties.