secondary Optical chut lulajpu'bogh led beq chep pat. tlha' aspects rewbe'mey'e' DaH nobvam chut lulajpu'bogh pat optical: optical pat, So'meH led 'ej according to lighting object luminous flux poQ; 'ej HoS size tu'lu'bej qIlmeH pIj ① luminous ta' Hal wov je lang chep Hal, annular tubes pagh illumination optical pat according to QamchoHmo' jIblIj Hoch tlhegh secondary chep Hal SIm secondary chep Hal ghor chep Hal, qaStaHvIS puS led chut lulajpu'bogh ②. 'oH potlh chep distribution Hoch led tube secondary chep Hal 'oH illumination optical pat chut lulajpu'bogh constitutes yISeH.
led beq tlheD color Dub. currently led (SuD Dev) commonly lo' chIS superimposed SuD tlheD-tlhuD SuD-tlhuD yttrium aluminum garnet (yag) phosphor, synthesized chIS led SuD. Human mIn color difference sensitivity be'nI'puqDaj veb puS QongDaqvo' intensity, lighting sensitivity, color Hal chep pIj latlh potlh puS luminous efficiency. vaj appropriate amount ghobe'-Qovpatlh tlhIH fluorescent 'och tIq chel 'ej laH efficiency luminous jen led chIS tIS neH potlh wanI'vammo' tlha' leH.