Extraordinary measures: the role of the lux meter

Different lux meters can provide different readings for the same LED. London Underground must provide safe levels of light for customers and staff, but this could be difficult without reliable lux measurements. London Underground, like much of the UK, is embracing LED lighting. Its low energy consumption and, more significantly, reduced maintenance, mean that there […]

Lightning and surge protection for outdoor lighting systems

A discussion on minimum dimensions of earthing conductors, as well as standardisation and potential control for connecting lamp poles and lightning equipotential bonding for outdoor wall lamps (LPZ0A). Whether outdoor lighting is wall-mounted or installed on open terrain, it remains important to determine the lightning protection zone, LPZ0A or LPZ0B. Outdoor lighting systems in LPZ0A […]

A new approach to luminaire quality evaluation

In August 2014, IESSA formed the Lighting Industry Technical Committee (LITC) to deal with matters of concern to the South African lighting industry. The LITC has also formed a working group tasked with evaluating the status of key industry challenges. The committee makes proposals to formulate action plans to deal with matters including SABS certification […]

Lighting for “Africa’s greenest hotel”

Hotel Verde, part of the BON Hotel Group, has been dubbed “Africa’s greenest hotel” for obvious reasons. Every aspect of the hotel is designed to be as sustainable as possible, employing efficient systems to save water and electricity while reducing waste. The building features green landscaping, a vegetated roof, three 3 kW vertical axis wind […]

Reliability and lifetime of LEDs

  With the increasing complexity of technical equipment, modules and individual components, reliability, lifetime and the cost of exchanging and revision become increasingly important for the customer. The single requirement that devices should not fail is no longer sufficient for modern, powerful components or devices. More often, it is an additional requirement that they should […]

Emergency lighting control by means of DALI

  With the global emergence of building automation, the powerful supervisory facilities and control of a DALI-based emergency lighting system in building designs and renovations are now too obvious to ignore. The Occupational Health and Safety (OHS) Act of 1993 states that emergency lighting must be provided in any workplace without natural lighting, that it […]

Partial flux – measurement reliability of lensed LEDs

  Most LED manufacturers use units of luminous intensity (cd) for the measurement and classification of LED brightness. This procedure is reliable and reproducible for numerous LED types, but is insufficient for LEDs with narrow emission angle characteristics. This article describes the procedures for measuring luminous intensity, partial flux and luminous flux, along with the […]

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