Lighting : LIGHTING August-September 2017
26 LIGHTING MAGAZINE | August/September 2017 August/September 2017 | LIGHTING MAGAZINE 27 Lovethemorloathethem,totallygetthem or haven’t a clue about them, LEDs are coming to a street near you very soon. But don’t worry, it’s a good thing, if it’s done correctly. There are many obvious benefits to LED on our roadways and a few you might not have thought about. The obvious benefits are energy savings, at least >40-50% if you do it right, longer lifetimes and of course, reduced maintenance. For Australia, I am much more interested in benefits far beyond simple power consumption mathematics. As any good street lighting engineer will tell you, the standard of lighting on our residential streets can be outstandingly bad. And not just bad, dangerous. If you come to my lovely street in a green Sydney shire and bring your luminance camera, you will very quickly discover even before taking it out of its box, the uniformity of light on the roads is dangerously poor; if a child in a black hoodie crossed the road in one of the many dark spots, a car wouldn’t even need to be speeding to have a problem seeing them clearly and be able to avoid plowing into them. So my thoughts are, if you are going to the expense of upgrading residential/urban roadway lighting to LED, surely we have a duty of care to ensure that the standard to which the road The challenges facing Australia on the inevitable change-over to LED on our streets OPINION is currently (under-) lit, is also upgraded? Saving lives, not just energy. Like everywhere on the planet currently, there is a lot of nonsense talked about LED and a convenient tendency to try to make LED as simple as HID. It’s neither relevant nor possible. I will attempt to clear up a few myths. If we look at Australia as a whole, probably 10% of our street lights are LED whilst most are HPS or even Mercury Vapour and I can’t even believe that new installations are still rolling out this ancient (c. 1860), high-UV, inefficient light source. So what are other countries around the world doing? If you speak to Ed Ebrahimian, Director, Bureau of Street Lighting, City of Los Angeles, he will tell you that he is extremely happy with the conversion of more than 160,000 light points to LED, essentially changing the famous “orange glow” city scape to more controlled/subdued neutral white. Ed started his program some 7-8 years ago. He once told me that an unexpected additional benefit of LED was that, in areas where drug deals take place, they like to shoot out the HPS street light for privacy, that usually involves one shot. They’ve literally had luminaires returned with multiple bullet holes that have taken out individual LEDs but left most of them still functioning: shoot the LED driver compartment! LA today, not such an orange glow anymore BY TREVOR LEIGHTON Sydney residential streets, little to no uniformity My own personal experience is that of Abu Dhabi and their rapid shift to all new projects being LED some 4-5 years ago and now a huge push on retro-fit. How do you make sure you get it right as a council, main road operator or electricity distributor? First you need to sort out a standards based process, simply asking manufacturers to provide a 150W HPS equivalent or even more loosely, for example, a “Cat P fitting”, is the road to replacing poor performing product with the same, or more likely, worse product. Every fitting we make “could” satisfy a Category P compliant design but that’s only true if it’s true. My son’s high power torch might satisfy a P5 if he shined it in the right place, after all we only need 0.5 Lux and basically no uniformity (<10%?). Perhaps the Australian Astronomical Society would like to re-classify a super moon as potentially being a “Cat P” luminaire? My sales guys know not to come to me asking for 100W of LED or even 17,000lm package: Any offer we make to a client needs to be validated by proper lighting designs! That can be a big challenge in towns and cities that have varying street configurations so what is needed, as a progressive Queensland based council are now doing for example, is an How do you make sure you get it right as a council, main road operator or electricity distributor?
LIGHTING October-November 2017