Ontario (Canada) has recently banned the 'Blue Bulbs'.
Although the blue coating actually reduces light output, many people fit higher wattage bulbs and that can significantly increase glare.

Another problem is that some of the cheaper aftermarket bulbs are not carefully aligned with their mounting bases so when fitted this changes the headlamp alignment. Very few people bother to have their lights re-aligned after a bulb change - and with properly manufactured bulbs you shouldn't have to.

Andy.