First, the original HID Headlights base on lower temperature. because quantity and formula of salt (pill) . HID Headlights use the very expensive metal iodate. Original HID xenon lamp manufacturers have already put numerous financial resources to research and development. This reseaces is regarded as the highest trade secrets. In addition to these, this kind of high purity iodate very expensive. Domestic most of the HID xenon lamp manufacturers often reduce  the dosage of iodate, so that HID Headlights temperature will be higher. If you look at the lamp arc position, you will found that the flow of on the market almost can't see things, But original HID xenon lamp can see yellow iodate (pill).