Step into the future
with the Systems Approach to Metal Halide Lighting Incorporating Uni-Form® Pulse Start Technology From Venture Lighting
The Next Generation of Metal Halide Lighting is
1) Uni-Form Bodies:
The arc tube is now a work of art!
Metal halide lamps started in the 1960s with
a cylindrical tube of quartz with ends pinched shut to form an arc tube.
The center section remained tubular (cylindrical). This design has remained
basically unchanged for thirty years. Now, with Ventures unique
quartz sculpting process, the shape of the arc chamber is contoured to
follow the curve of the arc, a significant change that leads to greatly
Ventures innovative formed body arc tube design
makes possible an optimum temperature profile in the chamber. This uniform
temperature profile provides even heating of the metal halides, allowing
these materials to reach a higher average temperature. Higher temperatures
mean more light generated by the arc tube.
Uni-Form pulse start lamps provide superior performance compared to old design
metal halide, specifically higher efficacy, better color uniformity, faster
warm-up and hot restrike, and longer life. The reason is the revolutionary
formed body arc tube combined with improved ballast design.
2) Pulse Start Technology:
Venture now offers newly-engineered ballasts fine-tuned
specifically for use with our Uni-Form pulse start lamps. With
Uni-Form pulse start technology, the new generation of metal halide
lighting systems, a high voltage pulse ignitor in the ballast jump-starts
a contoured, two-electrode arc chamber. In contrast, the traditional "tubular
pinch" arc tube has two main electrodes and a third starter electrode.
Starting is difficult (especially in cold weather), and each start damages
the electrodes and degrades lamp performance.
The use of an ignitor allows quicker cold starting
and faster hot restarts, a proven factor in longer lamp life and superior
lumen maintenance. Now starting is quicker and more reliable, and the
reduced damage to the electrodes results in a lamp which maintains its
light output for a longer period of time, thereby increasing life.
The Systems Approach to Lighting
The new high performance systems from Venture signify
a new approach to metal halide lighting. Lamp and component compatibility
is assured because the lamps, ballasts and controls are designed together
to provide a lighting system optimally suited to the application.
Lamp and ballast technologies have traditionally been
considered as separate. Many ballasts were standardized years ago. Lamp
manufacturers have been restricted to designs for existing ballasts. Similarly,
ballast manufacturers have been limited to improvements that would still
operate existing lamps.
With the systems approach to lighting design, changes
have been made both in arc chamber construction and ballast design to
optimize the performance of the whole system. This approach to lighting
has been tested and proven before an entire line of lamps were created
and ballasts made available. Venture Lighting now offers the largest selection
of Uni-form pulse start lamps, ballasts and controls in the industry.
Is this really a major improvement?
Are these Uni-Form pulse start lamps from Venture
really something new and significant?
Installation after installation confirms the amazing
benefits compared to old technology: increased efficacy, better color
uniformity, higher maintained lumens, quicker warm-up, and faster restart
times (to name a few)! As you read on you will see that Uni-Form
formed body arc tube lamps truly represent a major technological advancement,
well deserving of being called "the next generation"
of metal halide lighting.
What is Quartz Sculpting?
Precision control of arc chamber geometry.
There are two ways to fabricate a fused silica (quartz)
arc chamber: the traditional "tubular pinch" and the newer "formed
chamber" process involving quartz sculpting.
In the traditional process the ends of a cylindrical
tube of quartz are heated and pressed shut by two pinch jaws.
An arc tube created with standard quartz-forming technology
has thinner walls in the middle (where the quartz is blown out more) resulting
in a weak spot.
Ventures unique quartz sculpting technology
creates an arc tube with amazingly uniform wall thickness all the way
around! The result? A strong arc tube which can be operated at higher
The center of the body remains tubular; there is no
choice about this. This same disadvantage is present in some ceramic arc
tubes which remain a simple cylinder.
In contrast, the formed chamber process starts with
a smaller diameter quartz tube that is heated and blown out into a precisely
shaped mold that follows the contour of the arc. The mold also guarantees
accurate replication of the arc tube shape every time.
Ventures quartz sculpting technology, uses a
computer-controlled process that precisely gathers the heated quartz so
that once the bulb is blown out it will have uniform wall thickness. The
uniform wall thickness ensures that the shape and thermal characteristics
are meticulously correct for the wattage and arc length of the discharge.
The Benefits of Uni-Form Arc Chamber Shape:
- Higher lumens per watt
- Superior color uniformity
- Reduced thermal losses
- Greater energy savings
- Faster warm-up and hot restrike
- Open fixture option
Higher lumens per watt
Because of Ventures unique quartz sculpting
process, the formed body arc chamber has uniform wall thickness, resulting
in a stronger arc tube. As a result the loading of the arc chamber-the
temperature and pressure when it is fully warmed up-can be much higher
than with standard arc tubes. The result is a higher performing arc chamber.
Superior color uniformity
The color of a metal halide lamp is determined by
the vapor pressure of the chemicals or halides in the arc stream. Differences
in the vapor pressure from lamp to lamp result in differences in the spectral
emissions from different lamps. Uniform vapor pressure from lamp to lamp
is exactly what has been accomplished with the Uni-Form chamber
design. Because of the consistency of wall thickness and shape obtained
with Ventures quartz sculpting process, the arc chambers are all
identical in thermal characteristics. This ensures only minimal variation
in color in each lamp.
Reduced thermal losses
Compared with the standard cylindrical pinch arc tube,
the Uni-Form arc chamber is a compact, contoured design. A standard
400 watt arc tube weighs a bulky 20 grams; the 350 watt Uni-Form
chamber (which has a higher light output than the standard 400 watt arc
tube) weighs less than 7 grams! This 65% reduction in quartz weight and
the elimination of the wasteful heat-radiating pinch fins result in significantly
reduced thermal losses. Better retained heat contributes to more efficient
heating of the metal halide additives within the arc stream, producing
Greater Energy Savings
The Uni-Form pulse start system delivers more
light with lower energy usage. When compared to standard metal halide
technology, Uni-Form pulse start offers up to 50% improvement in
system lumens per watt. In addition, the use of Uni-Form pulse
start ballasts reduces energy losses by more than 50%. For example, the
320 watt Uni-Form pulse start is 25% more efficient than a standard
400 watt system.
Each time an arc tube starts, a small amount of
damage occurs to the electrodes, and the arc tube darkens a little. This
is particularly true of the old 3-electrode starting technology where
arc tubes sputter as they are trying to start.
UNI-FORM formed body
With the new pulse start technology, starting
is achieved quickly and efficiently with a high voltage pulse from an
ignitor. This permits the use of higher pressure fill gas in the arc chamber
which dramatically reduces the damage and performance degradation caused
Faster warm-up/Hot restrike
Our exclusive Uni-Form formed body arc tube
provides faster warm-up and hot re-strike in 60% less time. A high voltage
ignitor provides the break-down of the gases to start the arc, a much
more effective method for starting metal halide lamps than the starter
electrode technology. The higher gas fill pressures made possible with
pulse ignitor starting results in faster warm up, particularly immediately
after light-up. Combining ignitor starting and improved arc tube design
with higher gas fill pressures produces faster initial warm up and shorter
hot restrike time.
Open fixture designs
The compact Uni-Form formed body lamp allows
easy introduction of a cylindrical shroud or shield around the arc chamber,
eliminating the need to enclose the fixture for safety reasons. As a result,
open fixture rated Uni-Form pulse start lamps are available for
all applications from 50 through 450 watts. In contrast, the bulky arc
tubes used in traditional lamps are much harder to enclose in a shatter-proof
The open fixture rating allows greater flexibility
in design, lower fixture costs, and improved maintained lumens through
the elimination of glass lenses. Gone is the problem of reduced lighting
efficiency due to dirt accumulation on the lens, along with potentially
higher operating temperatures created with protective fixture enclosures.
The Advantages of Pulse Start:
- Quicker, more reliable starting
- Less electrode damage with each start
- Better lumen maintenance
- Longer life
- More energy-efficient ballasts
Quicker, more reliable starting
While standard metal halide lamps take up to two minutes
to ignite, the new pulse start lamps ignite immediately. Taken together
with faster warm-up times, this represents a significant improvement in
the time between throwing the switch and getting full light output. Our
exclusive Uni-Form formed body arc tube provides faster warm-up
and hot re-strike in 60% less time than standard metal halide lamps. Additionally,
the high voltage pulse ensures reliable starting even in cold weather!
Less electrode damage with each start!
Pulse start technology eliminates the third (starter)
electrode. Instead starting is accomplished with a high voltage ignitor
which is part of the ballast. This allows the arc chamber designers to
specify higher pressures of gas (argon) in the chamber, a feature which
leads, in turn, to reduced evaporation and sputtering of tungsten metal
from the electrodes at each start.
Better lumen maintenance
The reduction in tungsten metal deposition on the
walls directly reduces wall blackening and ensures maintenance of light
output for longer periods of burning. Not only do these lamps start at
higher lumens per watt, they maintain their output better as a percentage
of initial lumens! The combined result is a drastic improvement in mean
lumens. The light output stays bright even after thousands of hours!
Less electrode damage with use, reduced arc tube darkening
and improved lumen maintenance all lead to longer life for the lamp, less
replacement for the end-user!
More energy-efficient ballasts
Pulse start controlled current reactor ballasts for
use on 277 volt circuits are the latest addition to the Venture product
line. These enhanced reactors reduce ballast losses about 50% by eliminating
the need for voltage transformation. As an example, a 350 watt ballast
will use only 30 watts compared to 60 watts in standard 400 watt CWA ballasts.
The current crest factor is only 1.4, resulting in excellent lumen maintenance.
These reactor ballasts minimize the current draw during lamp starting
and open circuit conditions. As a result, system energy savings can amount
to over 25%.
How can I take advantage of the new technology?
Just select one of the Uni-Form pulse start
systems from our catalog, and you too can benefit from innovative thinking
at Venture Lighting!
Lamps are available in wattages from 50 through
1000 watt in open or enclosed styles; clear or coated versions; 2700K,
3000K, 4000K and 5000K color temperatures; Color Rendering Index (CRI)
options of 65-90+. Coupled with Ventures low current crest factor
CWA or 277 volt controlled current reactor ballasts, the long life Uni-Form
pulse start lamps demonstrate excellent lamp to lamp color consistency.
For More Information on Uni-Form Pulse
Start Systems Call:
1-800-451-2606 or fax 1-800-349-7771
Venture Lighting 32000 Aurora Rd. Solon, OH 44139-2814