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Chifeng Bridge, Tianjin, China

  • Chifeng Bridge, China
  • Chifeng Bridge, China
  • Chifeng Bridge, China
  • Chifeng Bridge, China
  • Lamp efficacy

    Lamp efficacy

    Ensuring the lamp efficiently converts electricity into light (lm/W).

  • Ballast classification

    Ballast classification

    Controlling the electricity supply to the lamp (Energy Efficiency Index).

  • Luminaire distribution

    Luminaire distribution

    Orus’ unique patented optic controls the light emission bending and shaping the light directly onto the road. Using only 35W version the light distribution in this example provides the perfect substitute for 250-400W traditional road lighting.

  • System efficacy

    System efficacy

    Combining optical and thermal control within the luminaire (luminaire lm/W).

  • Presence/absence detection

    Presence/absence detection

    Presence: Lights automatically turn on/off with movement. Absence: Lights automatically turn off and must be manually switched on.

  • Daylight detection

    Daylight detection

    Artificial lighting which responds to the natural light conditions.

  • Constant illuminance

    Constant illuminance

    A function designed to produce correct light levels for the duration of the maintenance period.

  • Task-scene setting

    Task-scene setting

    Allowing the user to set scenes and adapt the lighting to different tasks.

  • Timed off

    Timed off

    Automatic cut-off can be installed to turn all lights off during unoccupied hours.

  • Task lighting

    Task lighting

    Ensuring light is concentrated on the road provides the required high levels of illuminance while using minimal energy.

  • Zoning of lighting

    Zoning of lighting

    Lighting is zoned according to area use.

  • Maintenance schedule

    Maintenance schedule

    Maintenance must be performed in response to product age, performance and environment.

  • Waste light

    Waste light

    Orus’ FlatBeam technology helps to cast more than 93% luminous flux to the road. Precise optical control and luminaire aiming eliminates upward light and ensures no energy is wasted lighting the wrong area. By eliminating upward light, ecological disturbance is also minimised.

  • Reflectance

    Reflectance

    Taking advantage of light which is reflected from the surface within the space.

  • Visible smart metering

    Visible smart metering

    Results of actions can be quickly seen as increased or decreased energy use to encourage responsible energy consumption.

Located in the central business district of Tianjin Downtown, across the Hai River, Chifeng Bridge is the only inclined pylon double plane harp cable-stayed bridge in China. With a unique shape and complex twists and turns, it's Tianjin's landmark. Yet, despite its aspirational design, Chifeng Bridge was experiencing several lighting issues.

These included difficulties in maintaining and replacing lamps, high levels of light pollution and waste, low lighting uniformity and disabling glare. Visually, the bridge also appeared messy with traditionally styled pole luminaires employing high energy 250W-400W lamps

Low mounting height improves comfort and access

Following extensive field research to explore and demonstrate a series of lighting solutions, Thorn's Orus luminaire with its patented FlatBeam technology was chosen to refurbish Chifeng Bridge's lighting.

Orus has a special bi-directional optic, resulting in a unique light distribution which projects light transversally to the road. With a 35W HIT-CE lamp, it also offers excellent uniformity with no glare and low energy consumption. Above all, Orus has a mounting height of 0.9m to ensure no direct light enters vehicles and access and maintenance is significantly easier. The low mounting height also complements the bridge's extravagant design.

For low maintenance, Orus is constructed from high quality vandal resistant materials and engineered for a long operating life. The use of an electronic ballast further enhances energy savings and increases lamp life expectancy.

Michael Han, the Lighting Designer at Thorn, says: "Orus offered the ideal lighting solution for Chifeng Bridge. As well as providing an ideal mounting height, the optical system offers a very sharp and controlled light distribution while optimising the efficiency of the lamp. The use of ceramic metal halide lamps with 35W was the best choice in terms of light control, driver comfort and power consumption."

Key Facts

  • Total area covered: 63960m2

  • Total energy saving (per annum): 71%

  • CO2 saving per annum: 138.837 tonnes

  • Lighting level before: MEa4 Standard

  • Lighting level after: ME2 Standard