(1) What color to chose? (2) What is HI/LO? bi-xenon? (3) 35W vs. 55W (1) What color to chose? For HID kits, color is described in terms of Kelvin (K). The higher the number, the more blueish purple it will be. Typical K colors that exist are 3000K (yellow), 4500K, 5000K, 6000K, 8000K, 10000K, 12000K. You can see a chart of the different colors at Ultimate HID Kits. The yellow HID kits are good for fog lights as they yellow light penetrates fog better. all other colors are good for headlights. It is a questions of personal taste. The most popular colors are 6000K and 8000K (blueish white). The higher colors (above 10000K) give out less lighting power. The maximum lighting output is at around 4500K. (2) What is HI/LO? bi-xenon? This will depend on the type of vehicle you drive. For most vehicle, the headlights have 2 bulbs each: one for low beams and one for high beams. In this case, you will need one regular HID kit for the low beams. If you also want your high-beams to be HID lights, you will need a second regular HID kit. On some other vehicles, the headlights have one bulb each. This bulb performs the function of both the high beam and low beam. In this case, if you want to keep the high beam and low beam functions, you will need to install a special HI/LO kit. The HI/LO HID kits have special bulbs that perform both high and low beam functions. You can also install just a regular HID kit but in this case your high beams won't work anymore. (3) 35W vs. 55W You might have seen 35W and 55W HID kits advertised on websites. The 35W HID kits use 35W of power to produce HID light. The 55W use more power to produce more light. The ballasts are a bit different but the bulbs are the same. The 55W HID kits cost generally more than the 35W HID kits. This is a question of personal choice. If you need maximum light output, if you drive on very dark roads, you will want to install a 55W HID kits for more lighting power. Source: squidoo.com
Source:
http://www.squidoo.com/TypesofHID