Sparks Electrical News September 2016

LIGHTING

22

FACTOR OUT FLICKER

“O ne of the issues that can occur with flat panels is their tendency to flicker. And in a commercial office

managing director for South Africa. He explains that the human eye is sensitive to flickering light and, when exposed to it daily, it can lead to headaches, fatigue, blurred vision, eye-strain and reduced visual task performance and distraction. “So, although lumens and hours are important factors for customers when choosing LED panels, there are other key features that should not be ignored,” he says. “Basically, there are two forms of flicker,” explains Webber. “Percent- age flicker is the ac power frequen- cy-related light fluctuation and is measured as the amplitude vari- ation between the maximum and minimum values. Flicker index is a more efficient calculation as it includes differences in waveform shape and is caused by incompat- ibility of the light source to LED driver and/or switch.” Replacing traditional light sources with more efficient and longer-last- ing LED-based solid-state lighting (SSL) is an undeniable trend in the lighting industry and, like fluores- cent and HID, LED lighting is directly connected to the ac power supply at 50 Hz. However, unlike conven- tional sources, solid state lighting is a direct current (dc) device. This means that as long as constant cur-

or educational environment this can result in health implications and a problematic working environment,” says Warwick Webber, Aurora’s

H I G H P O W E R E D G E L I T L E D F L A T P A N E L S

ultra-slim, easy installation!

engineered with an edge-lit design and optical pattern light guide for even light distribution and also come with a flicker-free driver. The ranges can be found on page 26 of the Enlite Edition 4 catalogue. To download the latest catalogue, visit www.enlitelighting.com. Engineered by Aurora, an interna- tional LED lighting organisation that was voted ‘Manufacturer of the Year’ at the 2015 Lux Awards for its quality, value-for money products, Enlite is a brand of value-driven LED lamps and luminaires at competitive prices.

rent is supplied, the LED will illuminate without flicker but may still suffer from ripple, which is caused by the rectifica- tion of ac to dc. “Standards are unclear in terms of maximum acceptable flicker in LED light sources, particularly at the lower end of the dimming scale. Many driv- ers in the market place have a simple or poor circuit design to minimise cost at the detriment of flicker, but remov- ing flicker whilst still maintaining a high power factor in excess of 0.9 without compromising costs is a focus of the Enlite range,” he says. The new ultra-slim Enlite E6060 and E1260 LED flat panels have been

for energy saving upgrades, we’ve got you covered.

Enquiries: +27 11 234 4878

NEW LED LUMINAIRE FOR HARSH AND CORROSIVE INDUSTRIAL APPLICATIONS

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A frica’s leading manufacturer of energy efficient lu- minaires, BEKA Schréder, is set to launch its new Roughguard LED industrial luminaire into the local market at the upcoming Electra Mining Africa 2016 exhibi- tion taking place in Johannesburg in September. The Roughguard LED has been designed to be used in industrial corrosive and harsh environments. It will be

E S S E N T I

A L S

| H I G H Q U A L I T Y

| L O W P R I C E

B I G P E R F O R M A N C E

011 234 4878 infosa@enlitelighting.com za.enlitelighting.com

An

Group Company

manufactured using high-pressure die-cast marine grade aluminium with a robust clear polycarbonate diffuser. The

vandal-proof polycarbonate diffuser is secured to the body by six stainless steel Allen head tamper-proof screws. With applications such as police and prison cells, railway stations, underground parking ar- eas, mining workshops and others, where van- dalism and corrosive elements are prevalent, the Roughguard LED will be able to withstand these environments and provide light exactly where it is needed. The Roughguard LED has been designed to provide ease of installation and maintenance. All control gear components are mounted on the gear tray. The gear tray can be removed by loos- ening four Allen head screws in keyhole slots, which allow the gear tray to be relieved into a suspended position. This allows the technician to replace any damaged component with the lumi- naire still mounted in position. Customers can choose optional features which include • Dimming (0% - 100%); • Emergency versions – 1hour; and • Tamper-proof screws, and many combina- tions, depending on the application. The Roughguard LED is the ultimate solution available in the industrial market today for light- ing up harsh public and private spaces into more sustainable, safer and convivial environments. To preview the Roughguard LED with all its different features, visit the BEKA Schréder stand, number A9 in Hall 7 at Electra Mining Africa 2016 from 12 to 16 September, Expo Centre Nasrec, Johannesburg, South Africa.

Dimmers for LED + Halogen + Incandescent

TRAILING OR LEADING EDGE 125W, 500W AND 800W

Deep dimming. No flickering. NRCS RCC certificate for CoC. Silent. Recommended by all leading LED manufacturers. Maximum load varies by lamp. Minimum load 1 lamp. Details available on website under Resources tab – www.shuttlelighting.com

New Dimmer for DC-Bell Press. 9-48VDC. 96W-Maximum 8Amp. Specifications on our website. All products available from leading wholesalers. DC LED DIMMER

Enquiries: sales@shuttlelighting.com • Website: www.shuttlelighting.com Head Office: 021 448 8229 • Laboratory: 012 991 2521

Enquiries: +27 11 238 0069

SPARKS ELECTRICAL NEWS

SEPTEMBER 2016