Lighting : February 2014 Lighting (v2-HR)
52 LIGHTING MAGAZINE | February/March 2014 February/March 2014 | LIGHTING MAGAZINE 53 benefit of photometric testing, consumers would have no way of knowing whether a lamp has changed. Labelling needs to acknowledge this and inform the consumer accordingly. LABELLING The US Department of Energy has created a “Lighting Facts” label, which seeks to inform consumers of the photometric qualities for each LED product. Australia has followed suit, with Lighting Council Australia endorsing a similar optional label, as shown in Figure 3. New Zealand has not yet adopted this concept, though it is under discussion. The possible downfall of these labels is that they assume that the consumer is familiar with lumens rather than watts for light output. There is still some way to go before consumers think in these terms. A comparison of lumen output against the various halogen wattages would perhaps aid the transition. FOOTNOTES i IES of North America IES LM-79-08 “Approved Method: Electrical and Photometric Measurements of Solid- State Lighting Products”. ii New Zealand does not regulate in this manner, and does not have a similar comparison. iii ANSI/NEMA/ANSLG C78.377-2008 “American National Standard for electric lamps – Specifications for the Chromaticity of Solid State Lighting Products”. iv These tolerances are also referred to in New Zealand’s ENERGY STAR document for LED light bulbs CONCLUSIONS In summary, some LED MR16 lamps performed better than others, though none of the brands were able to match the lumen output of a 35W halogen lamp. Effective labelling is the key to distinguishing the good from the bad, however thought should be given to the way in which luminous flux will be understood by the average consumer. Labelling should also reflect product improvements, so that the consumer is able to differentiate the latest lamp from its predecessor. The MR16 investigation is ongoing, and is now assessing the irreversible effects of heat on the lamps in a typical domestic setting. Significantly, one lamp type has had to be withdrawn from the study due to possible fire risk. ACKNOWLEDGEMENTS The author wishes to thank EECA for supporting the research described above. The Active Reactor Control gear for energy savings and longer lamp life The Active Reactor is an electronic device incorporated into HID lights that delivers energy savings of 25% for HPS and 18% for MH lamps (with no dimming) and it extends lamp life. For 150W to 400W streetlights the Active Reactor is approved by VicRoads and is listed in the AEMO Load Tables. Customers include Ausgrid, Roads ACT and VicRoads and the Active Reactor is installed at many sites including Monash Freeway, Princes Highway and Melbourne CBD. For higher 1000W HPS and 2000W MH lamps the Active Reactor can be used for lighting freeways, airports and container terminals and sports grounds and stadiums. Customers include Hong Kong Jockey Club (Happy Valley and Sha Tin racecourses), Cranbourne Turf Club (night thoroughbred racing), Tabcorp Park (night harness racing) and DP World Brisbane Container Port facility. Dimming of 1000W HPS and 2000W MH lamps enables energy savings up to 40% to be realised. Contact: Active Reactor Company Pty Ltd, Melbourne, Australia Dr Richard Dluzniak: +61 3 9817 6677 or firstname.lastname@example.org Dr Brian Oldland: +61 3 8665 5524 or email@example.com Website: activereactor.com 150W - 400W Active Reactor Controller in IP67 housing 1000W - 2000W Active Reactor controllers (shown in control gear cubicle) Hong Kong Jockey Club – Sha Tin racecourse lit using 2kW Active Reactor dimming control gear. Hong Kong Jockey Club – Sha Tin racecourse close up of track lit with Active Reactor control gear. Collins Street Melbourne CBD – 400W MH Active Reactor control gear. expectation. Though figures were generally in line with those advertised, they were low in comparison to halogen lamps, with one lamp emitting only 162 lumens. The Australia MEPS formula for ELV halogen reflector lampsii equates this to a “15W” halogen lamp, which is well below the 35W halogen commonly used in New Zealand homes. To summarise, none of the eight lamp types were found to be 35W halogen replacements. Four met the 20W standard, with the remainder only suitable as 10W replacements. Of note, wattage did not necessarily correspond to lumen output. One 5.5W brand produced approximately 40% more lumens than a 6W brand. As it is common for the incumbent lamps to be compared based on wattage, this may cause issues with consumer understanding. COLOUR All lamps were in the 2700-3000K range, in order to replicate the ‘warm’ colour temperature of the halogen equivalent. The tolerances stated in ANSI/NEMA/ANSLG C78.377-2008iii were used as a benchmark in the experimentiv. The lamps generally fit within these limits, though one type consistently exceeded the upper boundary. This lamp type also failed the ENERGY STAR requirement that R9 must be above zero, while all other lamps complied. This highlights that inferior lamps can sit amongst quality on New Zealand retail shelves, with no visible difference marking one as superior to the other. CONSISTENCY Most lamp types were fairly photometrically consistent across the sample, though variance of up to 14% in lumen output was experienced in some cases. It was noted that the web documentation for one particular lamp type has changed over time, while maintaining the same product code. Three extra lamps of this same type were purchased several weeks after the first group. These looked identical to the original lamps in every way, from packaging to lamp envelope. Yet photometric testing revealed that they performed differently. This is best illustrated in Figure 2, which shows the original spectrum in colour overlaid with the new lamp spectrum in white outline. The new lamps had improved colour qualities, though lumen output was slightly less. While constant improvement is to be commended, it results in an inconsistent product. Without the FIGURE 2. Old spectrum (colour) overlaid with new spectrum (white outline). FIGURE 3. Sample Lighting Facts label (Image courtesy of Lighting Council Australia).
April May 2013
Lighting April 2014 - Vol 34 Issue 2