Electric.ie September/October Edition

ELECTRIC.IE • The Magazine & Website for the Irish Electrical Industry • 49 By working through this for each installation, it can be clear to see which lumen output and quantity of luminaires will deliver the best results. The next aspect is selecting the correct light distribution. In certain applications where luminaires have multiple light distributions, the overall lighting result, energy consumptions, and ultimately the ROI is hugely affected. There are examples where two luminaires, both offering 1,000 lumens, can deliver vastly different light levels into a space. By choosing a wider beam angle, less luminaires could potentially be used, which then in turn uses less energy – delivering cost savings. If we turn next to the performance of products, it is widely recognised that the performance of a light tting is a direct correlation to the makeup of its components. The focus here is the amount of light that a luminaire puts out, and how this can be maximised. The performance of raw LED chips is continuously growing, with the average raw LED lumens now sitting around 160 Lm/W. Once this is surrounded by metal casing and covered with a Luceco How to specify a cost-effective lighting installation ‒ With the cost of energy having reached its highest ever level, there is no doubt these surging price hikes are having a major impact on budgets and running costs. While this is frustrating, there are considerations that can be made at the lighting design stage to keep these costs to a minimum. ‒ Here Simon Shenton, Head of LED at Luceco Group, looks at how spending more upfront can in actual fact save money in the long-term. Lighting suppliers and installers play a key role in the overall energy consumption of a lighting installation. After all, their knowledge and expertise can have a significant impact when looking to reduce ongoing costs. End-users may feel that keeping the cost of solutions as low as possible is the most important goal. However, if contractors have an opportunity to discuss energy savings with them, and how this links directly to lifetime cost savings, this can encourage a shift in thinking and add value. To deliver true energy savings, there are several aspects of a lighting installation that need to be considered. Firstly, let’s look at lux levels. Every project has a minimum lux level that it truly needs to offer comfortable lighting. If lux levels are too high or too bright, not only can this be unpleasant for those exposed to that lighting, but it also uses more energy than is necessary. To put this into context, CIBSE recommendations for of ces are 300 lux for screen-based work and 500 lux for paperbased work. Yet data shows most of ces are 2040% overilluminated, creating discomfort and using energy unnecessarily. The next consideration is lumen output – effectively how much light is emitted into a space by the luminaire. To work through an example, let’s look at a 12m x 12m of ce space where LED panels are being used. There are multiple options when looking at the lumen outputs that could be selected to illuminate the space. By using a higher lumen level, such as 3500 lumens but fewer panels, this makes not only the cost of the panels lower, it also delivers a better return on investment when taking into consideration cost of energy consumption. Luceco Lighting