GREATER PERFORMANCE: PIAA bulbs are engineered with XTRA Technology for greater performance per watt than any other bulb on the road. (XTRA is a term coined by PIAA to designate a high-efficiency bulb that is designed to produce greater light output than its rated power consumption, i.e. 55W = 85W of light output.) Greatly enhance your ability to see and be seen. A metal bond holds the heat-resistant glass tube securely to prevent cracks and leaks. A welded focus ring and one-piece filament support assures proper positioning. BRILLIANT COLOR: Beam color affects visibility and eye strain over long periods. The brilliant white/blue light allows comfortable night driving over extended periods of time. PIAA bulbs are both a performance upgrade and an aesthetic enhancement. You will see the difference even in the daytime. WARRANTY AND SUPPORT: PIAA is so confident in the durability and reliability of our products that we offer a no questions asked, replacement of any halogen bulb that fails within one year of purchase. PIAA bulbs are an investment in safety and peace of mind. Super Plasma GT-X - The Super Plasma GT-X bulbs offer an unmatched combination of fashion and performance with a bluish-purple color very similar to H.I.D. and the closest yet to sunlight. Xtreme White / Xtreme White Plus / Xtreme Plus Hybrid - The Xtreme White Series of bulbs have a cool white light output that gives the driver better color recognition on depth perception and better contrast than stock halogen lamps. The blue top coat on this series of bulbs adds a slight blue tint to a lamp with no loss of performance.