The main difference between HID and halogen lamps is,
Light by gas ionization luminescence for the former. Light through heated tungsten filament for the latter. Although they are same between the luminous arc xenon lamp and halogen lamp filament length, but the brightness luminous efficiency is improvement of three times for the HID. It’s haven’t use the filament, not the traditional lamp is ease to fracture. So service time up to 10 times. according to the text, a 35W HID light source can make a 55W halogen lamp 3 times light luminous. The  service time as much as car lamp. So using halogen lamp can be save-energy. is represent the general trend that HID to replace halog lamp.

Comparison of HID gas discharge lamp and halogen bulb
Type         The bulb wattage                                  Color                            Service
——          lumen (W)               Luminous        temperature (K)   time(HR)
HID                  35                                3200                  6000                            2500
H4                     55                                1000                  3000                            300
9006                55                                1000                  3000                            250
H1                     55                                1500                  3200                            250
H7                     55                                1500                  3200                            250

The advantage of HID:
The halogen lamps light luminous system(filament) whit 12V dc voltage. Comparison of it, the HID does not using the filament, other advantage is that consumption of electricity only 50% tungsten halogen lamp. And it’s luminous is 3 times, and service life is five times the halogen lamps. Because the HID system just only consumption of electricity power only 36W,so it’s high efficiency and safety.
have the following characteristics:

1、three times output luminous.
Usually in the calculating the brightness of unit is usually called “Lumen” HID can be output the brightness up to 3200Lumen. While the halogen bulb can only be generated brightness on about 1000 Lumen. HID three times higher than traditional halogen lamp luminance efficiency,for the promotion of night and fog sight definition has the obvious the effect.

2, the color temperature is very comfortable
The so-called color temperature of light is a color temperature produce a light color, the lower the temperature, the color temperature will be close to red.Contrarily , will be close to bule, about 6000K light color just as white,