Normal 55/60w bulbs require no relay and wiring upgrade. These philips xtreme vision and many others are fully road legal (in EU & US, Pakistan is lawless in this area), and thus are plug and play.
The bulbs you are talking about are double the power (95/100w). They pull more amps that the stock wiring and relay does not support. So you'd require an upgrade if u want to install the higher wattage bulbs. Also, more watts = more heat. Heat may damage the plastic headlight case/shroud and warp/ burn it. So be careful.
If I could find HID headlamps for my indus corolla, I would definitely switch over to 4300/5000k HIDs of equal wattage to get more than double the light.
Alas, there are no HID projector headlamps for my model of rolla