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Heriot-Watt University, Scotland

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  • 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

    Controlling light emission using optics which bend and shape the light to the correct location.

  • 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

    Lighting task areas with the correct amount of light.

  • 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

    Eliminating waste light which does not hit the intended target.

  • 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.

Thorn's Isaro LED lantern was chosen to refurbish the outdoor lighting at Heriot-Watt University in Scotland. Following an initial trial and successful installation, Isaro LED has reduced annual energy consumption by 76%, is delivering associated maintenance savings and has also reduced light pollution.

With a history dating back to 1821, Heriot-Watt University in Scotland is known for being a world-class teaching facility with practical, leading-edge research. It has become one of the top UK universities for business and industry. The project included the refurbishment of the university's 3-4 miles of roads and pathways which were lit with more than 460 SON lamp luminaires. Thorn provided a high quality, reliable product along with a local service with product knowledge and design input.

The refurbishment project was based on replacing the old luminaires on a one for one basis. It therefore required a cost effective product that would fit onto a 34mm spigot, weigh no more than 10kg and provide high optical performance.The three main objectives were to reduce energy consumption, reduce maintenance costs and reduce light pollution.

Lighting objectives

The refurbishment project was based on replacing the old luminaires on a one for one basis. It therefore required a cost effective product that would fit onto a 34mm spigot, weigh no more than 10kg and provide high optical performance.

The three main objectives were to reduce energy consumption, reduce maintenance costs and reduce light pollution.

Lighting solution

Thorn's Isaro LED lantern offered the ideal solution for the university's outdoor lighting. Isaro LED is an economic, accurately controlled luminaire for minor and major roads. Its simple style offers an excellent refurbishment solution while advanced optical and thermal control ensures precision efficiency and a long lifetime. Isaro LED was trialled on site to confirm its optical performance and demonstrate its ease of installation by arriving ready to be installed, straight from the box.

Following a successful trial, the Thorn Isaro LED 42W (93Llm/W) and Isaro LED 31W (83Llm/W) were chosen to light the roads and pathways.

Results and benefits

The refurbishment of the university's old, inefficient lighting with Isaro LED has reduced annual energy consumption by 76%.

A long lamp lifetime of more than 60 000 hours (L70 @ Ta 25°C) also reduces maintenance and the associated costs.

In addition to reducing energy consumption and maintenance costs, Isaro LED offers adjustable tilting -20° to +10°. This reduces light pollution by allowing the light distribution to be matched with the geometry of the road with no upward stray light. The adjustable tilting also enabled the existing columns to be utilised, making the installation easy and cost effective.

Graeme Ramage, Key Account Manager at Thorn Lighting says: "The use of Isaro LED to refurbish the outdoor lighting at Heriot-Watt University has enabled the required illuminance to be achieved using a lower wattage luminaire. The installation of Isaro LED was really smooth and in fact, the programme was completed four weeks ahead of schedule. "

Key facts:

  • Annual energy consumption reduced by 76%
  • Annual carbon dioxide saving of 112 tonnes
  • Long lamp lifetime of more than 60,000 hours (L70 @ Ta 25°C) reduces maintenance and associated costs
  • Light pollution reduced by utilisng Isaro LED's adjustable tilting.