At PIAA, the research into new and innovative automotive lighting solutions is an ongoing process. PIAA engineers use CAD software in the design process and their products are subjected to rigorous tests at every stage of the manufacturing process. Like all of the company's products, the PIAA H4 Super Plasma GT-X Bulb is built with heat resistant glass for extended service life and includes a specially constructed metal focus ring to ensure proper mounting. The PIAA H4 Super Plasma GT-X Bulb does double-duty for your vehicle's lighting system, providing illumination for both high and low beams. In low-beam mode, the PIAA H4 Super Plasma GT-X bulb produces a purple-hued light that is sure to get attention, thanks to a purple-hued tint on top of the glass. The high beam is similar to full, natural sunlight, with a spectral rating of 5000 Kelvins (for comparison, the sun at high noon in a cloudless sky rates at 5250 Kelvins). The PIAA H4 Super Plasma GT-X Bulb uses the company's patented Xtreme White technology, enabling it to use energy more efficiently and put out illumination equivalent to bulbs of greater wattage for the same amount of energy. Experience the PIAA difference today! We know you should always get fantastic technical help while purchasing dependable auto parts from us. To support that need, we created a 24/7 technical support call bureau to support you with your requests. To sweeten the deal, we provide completely free shipping for every order $50 or more. If you find a better price, tell us - we always beat any legitimate auto part price.