Xtreme White Plus is PIAA's best-selling technology. These bulbs will provide a brilliant Xtreme cool white light that will light up road hazards and street signs long before a normal halogen bulb. Xtreme White Plus bulbs are engineered for sustained performance in applications where a high level of vibration and moisture protection is required. PIAA bulbs are engineered with XTRA Technology for greater performance per watt compared to the competition. XTRA Technology is achieved when a proprietary gas mixture is combined with an aerospace alloy filament that produces greater light output than its rated power consumption: i.e. 55W = 110W