Lighting : Lighting April 2014 - Vol 34 Issue 2
44 LIGHTING MAGAZINE | April/May 2014 ies Corporate members April/May 2014 | LIGHTING MAGAZINE 45 Alternative Lighting Queensland ANL Lighting Australia Pty Ltd Victoria & Tasmania Belltronic Lighting Solutions Queensland Citelum Australia Victoria & Tasmania Citelum Australia Queensland City of Sydney Council New South Wales Cundall Johnson & Partners Victoria & Tasmania Delta Energy Systems Victoria & Tasmania Domus Lighting Pty Ltd New South Wales Eagle Lighting - Fagerhult New Zealand Eagle Lighting Australia New South Wales Eagle Lighting Australia Victoria & Tasmania Eagle Lighting Australia Queensland ECC Lighting & Living - VIC Victoria & Tasmania ECC Lighting + Living Ltd - NSW New South Wales ECC NZ Ltd New Zealand Eco-Lightech Solution Ltd New Zealand eCubed Building Workshop New Zealand Enlightenz Group New Zealand ENTTEC Pty Ltd Victoria & Tasmania Gamma Illumination New South Wales Gamma Illumination South Australia GM Poles Queensland Haneco Lighting (Zhengtang Pty Ltd) South Australia Harcroft Lighting - NSW New South Wales Inlite - SA South Australia Intralux Australia Pty Ltd Queensland Jadecross Pty Ltd New South Wales JHA Consulting Engineers Pty Ltd New South Wales JSB Lighting Western Australia JSB Lighting South Australia JSB Lighting Victoria & Tasmania JSB Lighting Pty Ltd New South Wales KKDC New Zealand Ltd New Zealand Klik Systems Australia Pty Limited New South Wales Klik Systems QLD Queensland Klik Systems’s agent - H.I Lighting S.A South Australia Klik Systems’s agent - H.I. Lighting Western Australia Klik Systems’s agent - Mark Herring Lighting New Zealand Klik Systems’s Agent - Southern Lighting & Distribution Victoria & Tasmania Leadsun Victoria & Tasmania Lighting Australia Pty Ltd New South Wales Lights Lights Lights Victoria & Tasmania Lumen8 Architectural Lighting Queensland Mondoluce Western Australia Opal Lighting Systems New South Wales Optic Fibre & LED Lighting Solutions Pty Ltd New South Wales Orca Solar Lighting Pty Ltd Queensland Orion Solar Pty Ltd Queensland Peak Consultants Pty Ltd Western Australia QUT Photometric Laboratory Queensland Solus Lighting Solutions Queensland Sonic Lighting Victoria & Tasmania Stramac Pty Ltd New South Wales Sylvania Lighting Australasia Pty Ltd - SA South Australia Sylvania Lighting Australasia Pty Ltd - VIC Victoria & Tasmania Sylvania Lighting Australasia Pty Ltd - WA Western Australia Sylvania Lighting Australiasia Pty Ltd - NSW New South Wales Sylvania Lighting Australisia Pty Ltd - QLD Queensland The Lighting Group New South Wales TMK Consulting Engineers South Australia Total Electrical Connection Pty Ltd New South Wales Tridonic Australia Pty Ltd Victoria & Tasmania Tridonic Australia Pty Ltd New South Wales Versalux Pty Ltd - New Zealand New Zealand Versalux Pty Ltd - NSW New South Wales Versalux Pty Ltd - QLD Queensland Versalux Pty Ltd - SA South Australia Versalux Pty Ltd - VIC Victoria & Tasmania Vossloh-Schwabe Deutschland GMBH New South Wales Walter Wadey & Co Pty Ltd New South Wales Webb Australia Group New South Wales Webb Australia Group Queensland Webb Australia Group Victoria & Tasmania York Precision Plastics New South Wales FINANCIAL CORPORATE SPONSORS AS OF APRIL 2014 testing is the upper speed limit that these FFs apply to. Current thinking is up to 1,000fps. In my experience the majority of ultra-slo-mo replays are at 600fps. Any slower does not make production sense for most sports. The exceptions are sports like archery, clay-shooting etc. For example, in Beijing 2008 Olympics the predominant speeds used for USM were 300fps and 600fps. Solving for the competitor on the field of play (FOP) is one thing but the TV picture inevitably includes the spectators in the background as part of the whole ‘storytelling’. The FOP may be well balanced and phased but the spill light on the spectators in the background may not be so and the background will flicker. I have seen this many times. The suggestion should probably be at least to run an FF calculation on the background for the main camera. FLICkEr ‘WAVES’ Another area of exploration is the notion of aligning camera frame rates to the 50Hz lighting cycle for ‘better’ flicker control. The idea is for USM cameras to use speeds that are multiples of the mains frequency. I must stress I am not an electrical (or electronics) engineer and this is from an anecdotal viewpoint. At frame rates of 150 (SSM), 300, 450, 600, 750 and 900, the peaks of the 3 light cycles (of a balanced 3 phase lighting system) would ‘line up’ with the individual frames recorded by the camera. In 60 Hz countries, the fps would be 180, 360, 540, 720, 900 and 1080. Although there may be some flicker, this choice of speeds would, I think, reduce the ‘wave’ effect that is sometimes seen - the flicker shows an overriding rhythmic wave. This is not directly useful for the lighting designer but could be in discussion with a broadcaster when debating flicker. It obviously needs some further investigation and trials with broadcasters and lighting people. SummArISING There are rapidly evolving television broadcast technology developments that are having a major impact on sports broadcasts. In turn these advancements have a direct impact on the broadcast lighting of large sports stadiums and vice versa. In the future LED may be the panacea for the problematic flicker experienced with the widespread use of slow motion cameras and metal halide lamps. The ratio of light-emitting surface area (flashed) to the peak intensity of LED luminaires currently lags behind the best metal halide lamp types, negatively impacting on weight and sail/ windage area. The rapid evolution of LEDs, especially those with integrated complex lenses and miniature mirrors, will someday see LED luminaires being used in large outdoor major sports stadiums. Low mounting heights present challenges to broadcast. Note the temporary cardboard hood to stop spill light on the viewfinder.
February 2014 Lighting (v2-HR)
Lighting June 2014 - Vol 34 Issue 3