LIGHTING RETROFIT | NEW STREET STATION BEFORE AFTER Figure 3: Before and after images of retrofitted platform light at New Street station retaining the original equipment manufacturer-supported luminaire United Kingdom Conformity Assessment (UKCA) status. The approach would also be much cheaper. Following detailed discussions with Q Sustain, Designplan Lighting developed a retrofit option that replicated, but improved upon, the original lighting scheme. This included a special diffuser, which controlled glare, improved visual comfort, and minimised potential carbon emissions and time spent on a longer installation of a complete luminaire replacement. To measure the embodied carbon saved, Q Sustain calculated the embodied carbon associated with a new fitting similar to the originals. 1 LUMINAIRES AT NEW STREET A retrofit of the following three luminaire types was undertaken at Birminghams New Street station platforms (see panel, Luminaires at New Street). For the methodology of calculating basic embodied carbon, as stated within CIBSE TM65, see the panel Calculation methodology. Using the methodology, the total embodied carbon (kgCO2e) for the three luminaire types is: Fitting 1 18,342; Fitting 2 25,866; Fitting 3 118,584. So, the total embodied carbon associated with the light fittings is 18,342 + 25,866 + 118,584 = 162,792 kgCO2e = 163 tonnes of CO2e. Each time we retrofit a luminaire body with the gear tray, therefore, we are saving 163 tonnes CO2e of embodied carbon that would have been emitted if we had used a new luminaire (minus the gear tray). This works out at 39% of whole life carbon emissions a significant saving. Along with the carbon savings, the decision to retrofit gear trays of the luminaires has other benefits, including operational and energy savings. These are significant when you consider that 61% of the carbon emissions of a luminaire are operational (Figure 5). Operational and energy savings The older light fittings had an average energy point of 70W/fitting, whereas, with the new LED retrofit, the power wattage at each point is reduced to 30W. So, a power saving of 40W is achieved on each light fitting. As the luminaires are operational for 24 hours per day throughout the year, operational energy now consumed is 2 3 1. Fitting 1 - 2x28W T5 narrow body 91 no. 2. Fitting 2 - 2x36W T8 narrow body 130 no. 3. Fitting 3 - 2x36W T8 wide body 670 no. 3440 PB SBS 66x186mm Ad_AW.qxp_Layout 1 31/01/2023 11:04 Page 1 Smith Brothers stock the Ensign cast iron system, suitable for commercial, public and residential buildings. Scan the QR code for more information 36 March 2023 www.cibsejournal.com Made from 99% recycled materials and 100% recyclable A1 fired rated system High performing mechanical joints that can perform from 0.5 bar to in excess of 10 bar Cast iron is the quietest material on the market Full range of waste connection fittings 50-600mm diameter range Birmingham Bristol Cambridge Cardiff Glasgow Heathrow High Wycombe Leeds Leicester Merseyside Newcastle Northampton Oldham Peterborough Rainham Sheffield Southampton 0121 555 1900 0117 947 1111 0122 362 0926 0292 167 1250 0141 739 0060 0203 856 5620 0149 432 6926 0113 201 4222 0116 222 7355 0151 541 6440 0191 917 9922 0160 476 3621 0161 621 6288 0173 331 1711 0170 868 9900 0114 553 6500 0238 062 3070