i had some 100w H4's and was always getting flashed at, i fitted some Osram nightbreaker bulbs and that made a vast improvement, euro car parts are selling decent HID kits with a 12month warranty for £40 but sadly not the H4 fitment, as they are dipped and main beam you'd need H4-3 bulbs, ecp ones are just dipped beam in HID, not that you would need a full beam with HID's, their kits are 8000k and don't dazzle oncoming traffic like the 5&6000k ones