PIAA Powersports 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. 65w of consumption = 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 PIAA Xtreme White Plus Bulbs have a cool white light output that gives the driver better color recognition on depth perception and better contrast than stock halogen headlights The blue top-coat on these bulbs adds a light blue tint to a lamp with no loss of performance H13 (9008) 65/55W=85/75W xtreme white plus 4000K