Olympic Park

Auckland, New Zealand

Project Description

LDP Ltd undertook a feasibility study for Waitakere City Council (now Auckland Council) in 2009, considering options to light a pedestrian traffic route through Olympic Park as one element of a route linking residential areas to New Lynn town centre.

Concept and Brief

LDP Ltd undertook a feasibility study for Waitakere City Council (now Auckland Council) in 2009, considering options to light a pedestrian traffic route through Olympic Park as one element of a route linking residential areas to New Lynn town centre, including the New Lynn rail-bus interchange. The study examined a variety of luminaires, lamps technologies, power supply alternatives and sustainability elements.

This resulted in a decision by Council to proceed with an off-grid solar powered lighting installation using LED luminaires for the majority of the pathway lighting.

In particular, Council initially provided the following brief to LDP;

  • Provide good quality lighting (lighting design category P2 to AS/NZS1158)
  • Use solar power (i.e. no power from the grid)
  • Minimise obtrusive light effects beyond the park
  • Consider sustainable practices in equipment selection

Council also subsequently agreed to the following LDP recommendations;

  • Use recycled aluminium columns.
  • Reduce illumination to P3 during periods of the night when activity levels are expected to be low.
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Limitations

The solar engine needed to be designed to ensure that the lighting design levels were maintained throughout the agreed operating times at all times of year and throughout the anticipated life of the equipment.

The mass and windage of the solar engine and luminaire package needed to be minimised in order to minimise the size of the columns. This was particularly an issue for aluminium columns which have less strength than equivalent steel columns. Even so, the diameter of the columns needed to be 200mm.

In keeping with CPTED (Crime Prevention Through Environmental Design) principles, the lighting system needed to provide useful light several metres either side of the path, white light with good colour rendering and good visual comfort (low glare).

The Waitakere City Council District Plan required that the luminaires emit no direct upward light.

Maintain safe clearances from 110kV and 220kV overhead transmission lines. A specialist consultant in this field was engaged to ensure safe clearances were maintained.

Extent

The project extent being submitted includes the full length of the pathway linking the two roadside carpark areas. It excludes the carparks and the two ‘wind+solar’ pilot study lights as these areas are incomplete. The high pressure sodium lighting visible in the images is from the nearby and unrelated street lighting.

Lighting Concept

The lighting concept required an integrated lighting-power-control solution designed to be aesthetically pleasing in daytime while providing good quality lighting with good visual comfort at night. The lighting concept is founded on the principles of CPTED and sustainability.

This meant keeping the structures as close to human scale as practical, while having sufficient height to provide an economical means of achieving the P2 design category.

The luminaires are mounted at 6m. While the solar engine is higher, at night, the luminaire height tends to establish the perceived height of the structure. In addition, the dark grey colour chosen for the columns is recessive at night helping to minimise the visual impact. The overall result is that the installation does present as being human scale.

Architectural Integration

The lighting concept required an integrated lighting-power-control solution designed to be aesthetically pleasing in daytime while providing good quality lighting with good visual comfort at night. The lighting concept is founded on the principles of CPTED and sustainability.

This meant keeping the structures as close to human scale as practical, while having sufficient height to provide an economical means of achieving the P2 design category.

The luminaires are mounted at 6m. While the solar engine is higher, at night, the luminaire height tends to establish the perceived height of the structure. In addition, the dark grey colour chosen for the columns is recessive at night helping to minimise the visual impact. The overall result is that the installation does present as being human scale.

Architectural Integration

The street lighting columns recently installed for the adjacent New Lynn town centre have a dark grey finish. In order to provide visual continuity, this colour was continued into the pathway lighting equipment as much as possible. The recycled aluminium columns by their nature needed to have a substantial diameter (200mm) for strength. The dark finish helps to minimise the visual impact of the columns.

In addition, the chosen equipment has the solar panel, controls and luminaire integrated as one elegant package at the top of the column. This provides optimal integration of the various elements and removes the need for additional ground level boxes or unsightly additions to the column sides.

Originality

While we understand that the system has been used previously for flagpole lighting, this is the first application in New Zealand of the Carmanah Evergen solar lighting system for functional pathway lighting, and one of the first for the SAPA recycled aluminium columns. It is a significant project on the world stage for both companies and required a custom design from SAPA to accommodate the structural requirements of the Carmanah equipment.

Unlike many other solar lighting solutions, the system is designed to achieve;

  • Specific design lighting levels during all hours of operation while being completely off the grid.
  • Good quality lighting with minimised environmental effects.
  • Integrated luminaire – solar engine design to optimise efficiency.
  • Integrated operating profile and astronomic clock to optimise efficiency and minimise light pollution by reducing direct and reflected light at off-peak times.
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Solution

SOLUTION

The selected luminaire was the Ruud Edge 40 LED, version C, with a type II distribution and 4300K colour temperature. The mounting height for the luminaires is 6m and the maximum spacing is 19m.

Design Criteria

The design has met all of the design criteria;

    • Maintenance factor – There is much debate in the industry regarding suitable design criteria for LED lighting given the exceptionally long predicted life. We understand that IESNA is proposing using L70 to determine the useful life (i.e. the age at which the luminous flux output falls to 70%). Hence, we have used a lamp depreciation factor of 0.70. Similarly, as the luminaire is IP6x and since the locality would be considered ‘medium pollution’, we have assumed the longest cleaning cycle of 48 months in table F1, AS/NZS1158.1.3. Hence, the overall maintenance factor used = 0.70 x 0.84 = 0.59.
    • Dimming profile – The controls are factory set for the Carmanah “5-DIM-2” profile – 100% output for 5 hours after dusk and 2 hours before dawn – 25% output for the remaining night-time hours.
    • Results:
PARAMETER

PEAK TIMES (P2)

OFF-PEAK TIMES (P3)

TARGET

CALCULATED TARGET

CALCULATED

Average (Ehavg) ≥ 3.5 lux 5.3 lux (*) ≥ 1.3 lux 1.3 lux
Minimum (Eh) ≥ 0.7 lux 1.8 lux (*) ≥ 0.22 lux 0.45 lux
Uniformity (UE2) ≤ 10 1.5 ≤ 10 1.5
Vertical (EPv) ≥ 0.7 lux 1.0 ≥ 0.22 lux 0.25 lux

(*) In order to achieve the P2 minimum vertical illuminance requirements, the horizontal minimum and average values are higher than required. However, the higher values are also necessary to ensure that P3 requirements are met when the system dims to 25%.

Check measurements have been taken confirming that the initial values relating to these calculations have been achieved.

Visual Comfort

Glare is the most important element to consider for Visual Comfort. IESNA Technical Memorandum TM-15 has established a rating system for outdoor lighting known as the ‘BUG’ system, which stands for Backlight, Uplight & Glare. Each element is rated on a scale of 0 (best) to 5 (worst). The luminaires used for Olympic Park have a B1-U0-G1 rating. Hence, the Glare rating value of 1 is very good.

As indicated by the calculations above and as evidenced in the images, the uniformity is excellent.

The luminaires have neutral colour temperature of 4300K and good CRI (minimum 75). Combined with placing the luminaires well above standard viewing angles, the resulting effect is indeed visually comfortable.

Energy Effectiveness

In terms of impact on the national grid, the result is zero. In other words, the energy effectiveness is optimal.

The installation utilises the most efficient product available on the market at the time with the equipment features and colour temperature chosen.

Budget Restrictions

During the feasibility study, it was estimated that the capital cost penalty for solar over a reticulated power would be in the order of 20%. Council accepted this as a reasonable premium for a sustainable lighting system. The budgets were set based on our estimates, tendered and delivered within the final agreed budget.

Operation and Maintenance

The system operation is fully automatic. Each Evergen unit has an astronomical clock and daylight sensing. No adjustments are required for the life of the units.

The system is very low maintenance. The LED lamps, electronics, solar engine and columns are all estimated to have a service life in the order of 20 years and all have 5 year limited warranties. The only component that is expected to require replacement is the long life battery with a nominal 5 year life.

Periodic cleaning of the photovoltaic panels and luminaires is also recommended as with most outdoor equipment, to maintain efficiency and finishes.

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The Design

The increase in usage of the pathway in the evenings is testament to the success of the system. The lighting provides a pleasant ambience and good visibility along the pathway and a few metres either side, encouraging use through safety.

Lighting Equipment

In order to achieve the required lighting performance, optimise efficiency, minimise maintenance and provide a good aesthetic result, the Advanced Lighting Technologies Carmanah Evergen 1710 off-grid solar LED lighting system was chosen. This was complemented with custom designed SAPA recycled aluminium columns to maximise sustainability. Carmanah are based in Canada and SAPA in Holland.

The lighting equipment, as an integral solar-lighting device, was unique at the time of design in terms of the direct integration of LED driver electronics optimised for energy efficiency. We understand that this is still the case.

Pathway lighting is also a very good application for LED’s as the relatively limited spread of light required is suited to the precise nature of the photometric distribution produced by the lamp/luminaire combination relative to equivalent discharge lamp systems.

In addition, the Ruud Edge luminaire as used in the Carmanah Evergen 1710 system, presents an elegant appearance along with very effective optical control.

Innovation

This installation leads the way in a number of respects;

  • The first use of the Carmanah Evergen 1710 solar lighting system in New Zealand for pathway lighting.
  • A rare example of a purely solar powered lighting system that achieves good quality functional lighting to a recognised standard and does so all night, every night, regardless of weather conditions.
  • A rare example of using recycled aluminium columns – unique in terms of the custom design required to accommodate the windage and mass of the Evergen system.
  • Zero impact in terms of operation on fossil fuels, CO2 and greenhouse gas emissions.

Cost

The cost of the system as delivered was within the budget agreed with the client.

Awards

2011
-
Royal Astronomical Society of New Zealand Award of Excellence – Olympic Park, Auckland, New Zealand
2011
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IESANZ Award of Excellence – Olympic Park, Auckland, New Zealand

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