A well-conceived surge protection concept for LED lights should be incorporated at the design stage. In the process of retrofitting streetlights, conventional luminaires are frequently replaced by LEDs. The reasons for this include, for example, energy efficiency, subsidy programmes, removal of certain lamp technologies from the market and the long lifetime of the new LED […]
Chromaticity difference is specified for colour uniformity, shift in colour during lifetime and individual colour variation of products, and others. The chromaticity difference of light stimuli, in general, is expressed by the distance in the CIE 1976 uniform chromaticity scale (UCS) diagram (CIE, 2004; ISO/CIE, 2009), known as the CIE (u’,v‘) chromaticity diagram or simply […]
The process used to determine thermal resistance values from the LED junction-to-case and LED junction to Ts reference point. Part 1 of this article discusses measuring junction-to-case thermal resistance; determining the K-factor and testing Rth J-C (see Vector, March 2019, page 25). Thermal performance is the most critical aspect of a well-designed LED lighting system. […]
The process used to determine thermal resistance values from the LED junction to case and LED junction to Ts reference point. Thermal performance is the most critical aspect of a well-designed LED lighting system. Lighting installations with proper thermal designs have higher efficacy, meaning more light can be extracted using less energy, providing better long-term […]
Correlated colour temperature and colour rendering index are becoming outdated as lighting metrics such as LED technology develops and customers become discerning. Selecting the correct LED lighting products for both exterior and interior spaces has become essential in today’s fast-growing built environment and, with the advancement of LED, it is now easier to select suitable […]
Notes on providing lightning protection for LED mast lights with double or reinforced insulation; large masts fitted with supply distributors PVC masts and others. LED mast lights for street, walkway and open space lighting are mounted at light point heights of several metres to ensure large fields of illumination. This, however, is only possible if […]
Special optical adhesives enable the encapsulation of LEDs, termination of optical fibres and the assembly of complex lens systems. Optical grade epoxies, silicones and UV curable compounds offer engineers great versatility for bonding, sealing, coating and encapsulation applications. These systems adhere well to diverse substrates and offer excellent temperature resistance, stress relief and protection from […]
The LED chip is the core component of LED lighting. If the chip temperature is too high, the LED life and luminous quality could be severely affected. A heat sink is a common component in many electronic devices. It transfers the heat created by a device, acting to reduce the device’s temperature to prevent overheating. […]
Lighting installations on Virgin Atlantic aircraft through the years, a brief history of aircraft lighting and what the future appears to hold for these applications. Aircraft interiors have changed immeasurably in the past century, from railway carriage-style interiors to the opulence of the 1920s; the bland 1970s and now “hyper-personalised” premium spaces. And so has […]
Human health and wellbeing are influenced directly by light intensity; intensity distribution; dynamic aspects; light colour and colour distribution. Light affects human beings in a variety of ways: visually, psychologically and (photo) biologically. Its most obvious effect on humans is enabling vision but the psychological effects of light are related to the attractiveness, atmosphere and […]
