PUBLIC LIGHTING PART MEASUREMENT FOR NIGHT SKY GLARE INCREASING BEFORE AND AFTER SWITCHING OFF A BIG AREA (LIBEREC DISTRICT IN THE CZECH REPUBLIC)

摘要

In autumn 2009 we switched ff the publicrnlighting in the all district. In this district abutrn0,5 millin citizens live. The switching ffrnwas dne fr finding ut the public lightingrninfluence n night sky glares andrnilluminance caused by reflected part frnartificial light frm the atmsphere. Thisrnexperiment was cncepted in the large arearnf all districts. This certain district hasrnsuitable psitin frm this pint f view. It isrnbrdered by the muntains frm ne sidernand frm the secnd side it is pened t allrnCzech Republic (directin t Prague). Thernmeasurement cnceptin was chsen srnthat luminance and illuminance scanningrnwas dne bth in the centre f the districtrnbiggest city and utskirts. The utskirts werernchsen s that it is pssible t see bth trnthe dark muntains and bright largernindustrial centers ut f switched ff district.rnWe measured in the centre f the districtrncapital and in three uphill places situatedrnarund all district. As the switching ff wasrnallwed nly fr 1 hur (frm 1 a.m. t 2rna.m.) because f security services, wernplanned the measurement the fllwing way:rn We gt infrmatin abut night skyrncnditins and we measuredrnluminances and illuminances s thatrnwe fund ut the radiating prcess frnartificial lighting t the upperrnhemisphere at the night time.rn The aim f ur measurement was trnjudge the changes f radiating duringrnnight time.rn Maximum in the start f the nightrn Decreasing f radiating byrnswitching f a industry, shppingrncentre, windws and s n.rn We wanted t catch changesrnwhich depend n public lightingrnswitching f in small villages atrnmidnight (the public lighting d ntrnlit during all night) t.rn Last part f ur experiment wasrnswitching ff public lightingrnsystems which wrk during allrnnight.rnIn ur paper will be described allrnmeasured changes.