Posts tagged as Lighting Technical

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 […]

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 […]

Lightning and surge protection for rooftop PV systems

  Apart from damaging solar photovoltaic (PV) modules, inverters and monitoring elecronics, lightning strikes also lead to field-based and conducted electrical interference. According to the South African Photovoltaic Industry Association (SAPVIA), photovoltaic (PV) is the fastest growing power generation technology in the world. More than 35 GW of PV is installed and operating worldwide, producing […]

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 […]