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CU Phosco's Advanced Lighting Upgrade at Makkhawan Rangsan Bridge Shines a Light on Bangkok's Heritage with 72% Energy Savings

Ware – October 2024

Bangkok's Makkhawan Rangsan Bridge, a historic symbol, has undergone a
significant lighting enhancement as part of the city's celebrations for His Majesty the
King's 72nd birthday. In collaboration with Tasjinda Co, Ltd, CU Phosco has once
again demonstrated its expertise in delivering energy-efficient, high-performance
lighting solutions honouring Bangkok's rich heritage.

Makkhawan Rangsan Bridge, a century-old structure that graces Bangkok's inner
city, is a testament to the city's architectural heritage. Designed by Italian architect
Carlo Allegri and inspired by Paris's Pont Alexandre III, the bridge is adorned with
intricate steel frames and marble lamp posts. Inaugurated by King Chulalongkorn
(Rama V) in 1903, this bridge is a historical monument near the United Nations
offices in Thailand, Rajadamnern Boxing Stadium, and the Government House.

The bridge, which played a pivotal role during political demonstrations between 2010
and 2014, has now been modernised with a cutting-edge lighting solution provided
by CU Phosco. This project, executed as part of the broader "Celebrations on the
Auspicious Occasion of His Majesty the King's 6th Cycle Birthday Anniversary,"
sought to enhance the bridge's aesthetic appeal and safety while achieving
significant energy savings.

CU Phosco, through its local partner Tasjinda Co, Ltd, delivered a comprehensive
lighting solution featuring FL820 LED floodlights. Known for their exceptional
performance, durability, and energy efficiency, the floodlights were pivotal in meeting
the project's key requirements: increased lumen output, a cool white light, no light
pollution, and reduced energy consumption.

The project involved replacing the previous 36 metal halide (MH) luminaires, each
consuming 440W, with just 9 FL820 LED floodlights, each drawing 500W. The
FL820 floodlights, designed to replace traditional 1kW or 2kW systems, offer
superior luminaire efficacy of up to 154 lm/W and feature a low-glare design,
ensuring compliance with IESNA standards while minimising light spill into
surrounding areas.

The project also included replacing mast-mounted control cabinets, connectors, and
underground cables, all of which were completed within the 60-day timeframe.

Implementing CU Phosco's FL820 LED floodlights at Makkhawan Rangsan Bridge
substantially increased light output, making the area brighter, more appealing, and
overall safer, ensuring better visibility for drivers and pedestrians. The upgrade
reduced the total energy consumption from 15,840W to 4,500W, translating into a
remarkable 72% energy saving. This project highlights the bridge's architectural
beauty and reinforces Bangkok's commitment to sustainability and energy efficiency.
Pop Jindavanich, representative of Tasjinda Co, Ltd, commented, "The Makkhawan
Rangsan Bridge project showcases the impact of innovative lighting solutions in
preserving and enhancing the historical essence of Bangkok's landmarks. Having
been impressed with CU Phosco's results on earlier projects, the end customer was
eager to achieve the same level of efficiency and light quality in this prestigious
project. The significant energy savings and improved light quality result from our
commitment to delivering excellence."