Quartz Halogen Globes (QH) Vs High Intensity Discharge Systems (HID)
QH and HID use different processes for producing light output.
QH technology consists of a globe connected to power. They work by running 12 or 24 volt power through a tungsten filament that
is surrounded by inert gas (gas that will not burn or ignite) inside a quartz glass bulb. Quite simply, power is applied to the filament,
it is heated until it glows and produces light. The inert gas sealed inside the quartz glass prevents the filament from burning and
HID technology consists of a globe, starter and ballast connected to power. The globe is a quartz tube filled with Xenon gas, with
tungsten electrodes housed at each end. The bulb functions by running 23,000 volts through the tube (generated by the starter) that
ignites the gas and produces an arc of light between the electrodes. Once ignited, the ballast regulates the voltage back to 85 volts to
keep the arc running.
QH and HID have different performance, power consumption and lifespans.
Standard headlights use 55 watt QH globes and have an average lifespan of 200 hours of operation. HID globes in comparison
generate around 3 times the light output of a 55 watt QH, however use a third less power (35 Watt HID), and have a lifespan of
about 2000 hours – about 10 times that of QH.
Note: Xray Vision QH Driving Lights use 100 watt QH globes, providing superior performance over standard vehicle headlights.
QH and HID also run different Correlated Colour Temperatures: QH is around 3500K (yellowish is appearance), whereas HID run
at between 4200 K and 6000 K (clean white colour, closer to daylight).
In short, HID globes are brighter, last longer, use less power and produce light that is closer to daylight in colour, compared
to quartz halogen globes.