i often see the advise here that whenever we install higher wattage bulbs on the headlight, that we should add a relay and ceramic sockets.

with ordinary sockets, i know that they might melt because of the high heat generated by the bulbs. but what about the relay? what if i don't install a relay and use 90/100 bulbs? what would be the effect? hindi iilaw? mabilis madrain battery? somehow, i just read the warnings pero wala namang nakapost on what the effects would be.

thanks.