100% water proof construction， you can submerge the entire bulb under water IP68.Perfect color match technology.Ultimate reliability using SSTC Technology to ensure long life.Color temperature output has tolerance of +/- 100K， the tolerance is unnoticeable by human eyes.Superior lumen output compare to its competitor 3200+ on average.Best quality burners from Bosch Japan.Up to 3000 Hours Lifetime.Shock ProofHeat ResistantQuartz GlassSingle Beam: H1， H3， H7， H8=H9=H11，5202=H15， H10=9005=HB3Dual Beam (H/L):H4-3=HB2=9003， H13=9008， 9004=9007=HB1=HB5H8/H9/H11 can be generic;5202/H15 can be generic;H10/9005/HB3 can be generic;H13/9008 can be generic;H4-3/HB2/9003 can be generic;9004/9007/HB1/HB5 can be generic;What color should I choose?5000K - A popular color matching original HID lamps on vehicles such as BMW and Mercedes.6000K - Adds a touch of blue to make it more cooler white. One of the most popular colors on the market.8000K - For those who want a little more exotic blue color added to their light.10000K - For those who want more blue light for that ultimate in exotic. Keep in mind， 10000K is NOT the brightest color because it is the most blue we offer.What bulb is for my vehicle? Help!Step 1: Select your vehicle from this guide below:Check the bulb application guide here:Step 2: Depending on your vehicle， it may ask you if you have composite HID headlights. Some newer vehicles come with factory HID / Xenon such as Audi BMW Mercedes etc... if your vehicle has factory HID make sure you order the correct bulb size from the drop down.If you want bi-xenon bulbs w/relay harness that does low and high HID， see our ad here (9004 9007 H13 H4)Vehicles with factory HID / Xenon:If your vehicle has factory xenon (D1S D1R D2S D2R D4S D4R) choose the correct bulb above from the drop down. Remember these bulb types are sold individually (not pair).Vehicles with composite headlights also known as halogen bulbsChoose the correct bulb above from the drop down. These type of bulbs are sold as a pair. You get two. Remember， these bulbs require HID ballast to power them. We assume you already have these otherwise you can buy them separate.Do your bulbs come with HID ballasts to power them?Negative. You must buy those separate or you may already have them. Please do not think this is a complete HID conversion kit. We are only selling replacement bulbs.I have factory halogen light bulbs， can I buy these bulbs and install them to get brighter light?No， these HID bulbs required HID ballasts. If you do not have an existing kit， you will need to buy HID ballasts as well. We are only selling replacement bulbs.My car has factory HID (such as Audi / BMW / Mercedes / Cadillac) and one bulb is burned out. Can I buy just 1 bulb?First， you need to check to see if your vehicle came with factory HID / Xenon. Next， you need to test to see if indeed your bulb is burned out and NOT your ballast. Even OEM ballasts can go bad. You can do this by swapping the bulbs from one side to another. If you do decide to buy a pair of bulbs， remember， our D1S D1R D2S D2R D4S D4R are sold individually. So you recommend you buy 2 and change both so the color matches.