EXPERIMENTAL STUDY ON DISCOMFORT GLARE CAUSED BY WINDOWS PART 3 : Development of a method for evaluating discomfort glare from a large light source

Abstract

秕 s 阿 rer describes 山 e 爬 sults ob 齟 鵬 d m an expe 血 nent using a simUlat｛ Xi ・ window 血 an ・ errviro cnt test chantber that is assumed to be − an actual office ． Total of 120 corKlitions with the wi 【 Ulow 1 血 nance I孤 gi 聡g from 2000 to 20000 cdlm2 and with the windew size in solid ang 且 e ging m O， 021to O． 970 sr were teSted ． The objective of the experimenI was to fi 皿 ¢ am 巳thod for owaluating g 且 are from windows with awide applicablc 皿 nge ofso 皿 roe sire ． The fom 皿ita which was broughi by止e eXperimen 田1 爬 sults has the exponent ofbackgrc ） und lu皿 血 ξ m with a pa eter of sou 量 じe sセe ， This formula was examined agajnst 廿te dala fbm ou 叩 reVious experimentS conduCted 血 actual room ミ pag 巳s． Our glare fbrmula predicts s 呵 ective I℃ s1 翆 ⊃nse mole 瓰 tionally c 軸 1匪 y in the case oflalge hght source than 山暗 exis廿ng 9 indioes ， sj皿 ce it takes the effeCt of total a皿 ou 皿 of light i ［ niderrt on 山e subj ect ' s Cyes inte accoun 亀 ． 鳳 ay " erttg ： daytig 海t． dis ' eemfort gtare， subjective respOnse ， windOW ， large light SO urce 昼 光 照明 ，不快グ レ ァ ，被験者実験 ，窓，大光源 1． In量 roducfion It is impor伽 t to use daylight available ffOm windows for interior lighti ng in order tO provide psycho − physical oomfb 道 in m 。m space 跏 d 山e 廟 眈 duce血e elec ‡ ric power consumpti 。n for 1ighting ． Dayli 帥 t av 詛lable 伽 m windows should be used in a manner that it does not cause dis ◎omfort glare ． Accord重 ng to our previous experimentS conduCted witb simulated and ac 劬 al w 血dows ， there a ： e some pTeblems in applying the eXiSting g 蛩 ale h雌 ces to evaluate discomfbrt glare rationally especially fu⊃m 且 … e 藍 ght sources 1） ・ 2九3） ．［ he pu甲 ose ofthis stUdy is tO make an experiment in temis ofglare sensati 。n agai 耐 1arge light sources using a 且 uminous environmental teSt chamber and hence to propose an equa 白on apPlicab 呈 e to predicdng 91a 盻 sensation against lε e 】 ight sources ． 2． Experimental me † hod G 且 are sensation is considered to be a 血mction of the lurninance and the size ofglare sourcc and the luminarice of the background ． in order to make clear how mu （ th each of 血ose 飴ctOrs influenoe glare sensation ， we made two oxperiments described be豊 ow ． 2． 1Expe 而men 奮 d condi † ions Table 1 outlines tle experimental con 面 ons 、 We made the 血rst experiment With cne hundred conditions which include 丘ve 雌 rent 曲 es 。fwindow luminance ， seating posnions i岫 e charnber ， 飾 e sizes ofwindow 跏 伽 o 螂 cs of background refiectanee ． In the second experiment ， an addition tO the first one ， 血ere were tWenty conditions ： a