WHAT IS A DAYLIGHT HID
LIGHT?
DAYLIGHT
HID is identical
to
HMI
TM
technology. It is a metal-halide high intensity gas discharge medium
arc-length lamp. The technology incorporates Mercury (Hg), as a vapor mixed
with other rare halides in a quartz-glass envelope with two tungsten-coated
electrodes of medium arc separation.
Unlike
traditional tungsten lighting units, DAYLIGHT HID lights use ballasts to
regulate and supply electricity to the lamp head. The lamp operates not by
heating a tungsten-based filament, but rather by creating an electrical arc
between two electrodes within the bulb that excites the pressurized mercury
vapor and provides phenomenal light output with greater efficiency than
tungsten-based lighting units.
The
efficiency advantage is near four-fold, with approximately 85-108 lumens per
watt of electricity. Unlike tungsten bulbs where the gas is inert and solely
for filler and recirculation, DAYLIGHT HID bulbs rely heavily on the mercury
vapor for light output, and the other metal halides mixed with the mercury
to give it the light spectrum that bring it to approximately 5300K, or the
color temperature of noon sunlight.
Ballast Operation
In order to
power a DAYLIGHT HID bulb, special ballasts act as an igniter to initially
start the arc, and then regulate it by acting as a choke. Two types of
ballasts exist - magnetic and electronic (square-wave). Magnetic
ballasts are generally much heavier and bulkier than electronic ballasts.
Standard magnetic ballasts are not suitable for film or video recording as
they "flicker"
and cause fame to frame exposure variations.
Within the
last ten years, electronic Square-Wave ballasts have become
increasingly popular and affordable as an alternative to magnetic ballasts.
These ballasts are commonly used in industrial task lighting and sports
stadiums and gyms. These ballasts operate with 300-500 HZ cycles and
are not suitable for film or video recording as they also cause fame to
frame exposure variations.
ALZO DAYLIGHT HID High
Frequency Ballast Operation
ALZO DAYLIGHT HID ballast
is a patented high frequency modulated flicker free electronic ballast that
uses microcomputer modulated AC power to prevent flicker. The ballast is
specifically designed for video or film recording with regulation circuitry
to maintain consistent color temperature over the life of the bulb.
ALZO DAYLIGHT HID Bulb
The ALZO DAYLIGHT HID Bulb
is a double envelope white frosted Metal Halide bulb with a color
temperature of about 5300K and a life of near 7000 hours. The frosting is
not a coating but is a white glass that will not discolor or wear off the
bulb. This white glass also softens the light emitted from the bulb as
uncoated DAYLIGHT HID bulbs produce very harsh light.
