On September 15, 2001, exactly a year since the start of the Sydney
2000 Olympic Games, Sydney's world famous Olympic Cauldron was re-kindled
in it's new, permanent home at Sydney's Homebush Bay.
Cauldron was re-lit at dusk to beating drums and resounding cheers
in its new location in The Overflow Park on Olympic Boulevard. The
stainless steel bowl is suspended on new stainless steel legs and
will stand as a permanent reminder of the success of the Games.
was conceived and designed by Barry Webb, Iain Clark and Fiona McVicar
of Barry Webb & Associates, with Show Technology’s Architectural
Products Manager Jonathan Ciddor assisting with the configuration,
control and integration. Beyond AV, as the installation contractor,
were responsible for the co-ordination, preparation, installation
and programming of the lighting system for the Electrical Contractor,
Heyday Electrics and the builder, Thiess Pty Ltd.
sits upon a concrete slab at ground level and beneath it is a large
chamber 5 metres deep, housing the lighting equipment, pumping and
gas controls, and a large water tank. On the ceiling of the pit
are twenty-two Clay Paky Goldenscan 3 arranged in two rings. The
outer ring has sixteen fixtures whilst the inner ring has six. The
Goldenscan 3 are positioned with their mirrors up near the ceiling
of the chamber projecting light through 220 mm round glass portholes.
3 were chosen for the project because their mirror offered the ability
to move the light beam into a precise position. Another critical
factor in the choice was the fact that the Goldenscan 3 deploy a
HMI 1200 watt lamp enabling the beams to project over ten metres
to effectively illuminate the cauldron and support structure, and
water flowing down from above. The beams remain static and usually
white in colour, colour changing reserved for special occasions.
the beam angle is quite wide and the porthole quite narrow in diameter
it was very difficult to get the beams to line up properly,”
explained Con Andrews, Managing Director of Beyond AV. “Consequently
movement of the beam is virtually impossible.”
the design phase Fiona McVicar spent considerable time ray tracing
the beams from multiple locations to ensure they would get through
the port holes and at the same time achieve an even light distribution
across the whole of cauldron and water flow. Once the portholes
were cast in the pit’s roof slab there was minimal opportunity
to adjust the beams, so design accuracy was paramount. To accommodate
the requirements Show Technology and Clay Paky provided a special
wide angle lens combination to increase the beam angle from the
standard 16° beam angle out to 23°. This enabled a more
uniform coverage of the Cauldron.
system is centred on the Martin LightJockey PC based control system
and, with the recent software upgrade to include real time scheduling,
can operate stand alone to activate specific cues as specific times
or integrate to accept triggers from a diverse range of sources.
The whole Olympic precinct exterior lighting was controlled by a
conventional Clipsal CBus control system, including the Overflow
Park, so it was essential that a simple interface allow the pre-programmed
Cauldron shows to run reliably, precisely and in co-ordination with
the park lighting. The Martin AD-DA interface for Light Jockey allows
multiple external triggers to activate whole cue sequences. This
way C Bus provides a contact closure and initiates the show.
described the significant components of the system “With 22
luminaires operating in an industrial environment, 5 metres off
the deck, and below ground, with high pressure water and gas piping
running all over the pit, the DMX is via individual opto-isolated
runs through LSC splitters. This way if there is a cabling fault
it is very fast and easy to locate. Luminaire interruptions are
also minimised using opto-isolation.
had to co-ordinate the power up of the Goldenscan 3’s. Striking
22 off 1200w HMI lamps pulls a significant current that would have
required excessive power engineering. Using DMX to drive standard
mains electrical contactors the Goldenscan 3’s are turned
on and off in a sequence and are ready for each show.”
show some odd looking Goldenscan 3’s. All have been fitted
with galvanized drip covers to ensure any condensation from the
port holes is deflected away from the luminaires. The body of the
units have been flipped as well. This enables the whole bottom plate,
as well as the end plate and PCBs to be removed for cleaning and
servicing. So when you are standing 5 metres off the deck life is
as easy and safe as possible. It also means that the critical focus
is not altered during servicing and maintenance.”
confirmed that these were significant issues identified right back
at the design stage and were easily solved by Show Technology and
ClayPaky recommending Goldenscan 3 for the project. When these issues
were combined with the proven track record of Goldenscan 1, 2 and
3 over the last 10 years, the number of units in the Australian
marketplace and the support available, it was a clear choice.
that the success of the project is a tribute to the team of lighting
designers and technologists as well as the Australian architect
Alec Tzannes,” concluded Barry Webb.