Agenda - 02-28-2011 - C.1 - Laserfiche WebLink

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lrOIN designer to provide adequate illuminance above the ground on sports fields in order to ensure the players will have proper visuaj perfbrmance while. the ball is 9n flight, however excessive illia in -ation in the sky is regarded as wasted energy. Additionally, excessive sky glow results in reduced visibility of the night sky for local astronomers. Some local authorities are limiting the amount of sky glow with specifications governing all new and retro -fit installations. VL How is sky glow measured? Sky glow is sometimes controlled by establishing a limit on the average and maximum illuminance at a specified elevation above the height of the light poles. This method is effective in quantifying the severity of the sky glow, however it is not easily field verified. Due primarily to the limitations associated with field verification, many ordinances require pre - qualification of the manufacturers' ligj Ling designs based on the theoretical values calculated by a fighting-design computer program. A. Specifications can be written to limit the amount of lumens or candlepower the luminaire emits at a specified angle from the direction of maximum candlepower of the luminaire, which ensures that a luminaire is, being utilized that is efficient in reducing spill and glare. Along with this, it is important to set limits on vertical aiming angles, since aiming angles that are too shallow can result in glare. Even a well designed luminaire requires an appropriate mounting height and sound aiming logic, which will result in good vertical aiming angles. B. Another way of specifying sky glow is to place a limit on the amount or percentage of the luminaire's total lumens that may be emitted at or above the horizon. This method allows for the use of a luminaire with less ability to control spill and glare to meet the specified limit on sky glow, providing a taller mounting height is used. The purpose of this document is to provide an educational reference for specific technical issues that affect the quality and performance of a sports lighting system. Prepared by: Dave Barker Draft date: April 12, 2001 Released: revised October 1, 2001 Mu3co products referenced or shown are protected by one or more of the following patents. U.S. Patents: 4712167; 4811181; 4994718; 501239.6075826; 6134557; 6161883; 5207747; 5211473; 6229881; 5313378,6337221; 5343374; 5377811; 5398478:6402327.6423281:542W7; 55195W. 6595440; 6800537; 5838024; 5647661; 5707142: 6794387; 580004.6816691; 5851317211:68607M; 5887969; 5900425; 5944413; 6016389; 6038338; 8203176; 8 22072.625069.6340790; 6398; 0446408; 6464186; 6676277; 6681110; 6692142; 6839876; 6929386, 8909034; 6988697; 7069872; 7059746; 7171793; 7178836; 7208850; 7216437; 7246782: 0337188; 0353797; D363911; 0411098. Australia Patents: 670062; 705971; 706912; 760663; 784185; 200715190& BrarB Patents: 13193057245; PM=174& Canada Patents; 8936.2098749; 2026860: 2027033; 2035014; 2058261; 2060565; 2087064; 2103874; 2110014;2200511,2200616;2204958; 2210228; 2217872; 2378279 ,2518283;2378318;2407922; 2407924. China Patents: ZL9S192709.7: ZL30139426.7. EPC Patents: 440531; 804704; 82177.1'19270% 0003764904DM France Patents: 440631. Germany Patent; 440531. Greece Patent: 3032360. Hungary Patent 216501. Ireland Patents: 804704; 821776;1192793. It* Patent 804704 Japan Patents: 3270032; 3651008; 3740681. WACO Patents: 17586. 183226;198837; 241985. New Zealand Patents: 248620; 301212:307705; 333808. Norway Patent DESIGNREG.NR.: 79633. Russia Patent 61440. South Korea Patents: 29254.405147; 406764; 581799. Spain Petard: 440631. Sri Lanka Patent 13133. Taiwan Patent 1263753. Vietnam Patent 9692. Other patents pending. # TB0005 Page 5 of 5