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whiter), the colour of the light is determined in incandescent Fluorescent Light Characteristics lamps by the temperature of the tungsten filament (which is Fluorescent light (FL) comes in many different colours and around 2,700 K in GLS bulbs and up to 3,300 K in halogen qualities, but despite so much effort being put into trying to copy lamps). In fluorescent and HID lamps, the colour and SPD are the colour and quality of incandescent light and sunlight, most FL produced by the different colours of the phosphors and/or gases and HID lamps still produce a light that usually looks and feels they contain (which, when added together in various combina- more or less unnatural since it is not based on the element of fire. tions and proportions, appear to the eye as white, orange-white, In a spectral power distribution chart, FL creates a ragged line pink-white or blue-white light) and the CCT that each colour type with peaks at various individual wavelengths and drops in others. is designated is the one it visually most closely resembles. The As the FL or HID lamp ages, its light becomes progressively temperature scale for light is often divided into four groups: weaker and even more cold and unnatural-looking because the 1,700-2,900 K is called "warm"; 2,900-3,300 K, "warm-white"; phosphors that produce the red part of the light are exhausted 3,300-5,000 K, "cool-white"; and 5,000—10,000 K, "daylight". before the ones that produce the green and blue parts. This means All incandescent lamps, including halogen, produce a top- that even if a lamp keeps on functioning for, say, 16,000 hours, quality golden-white light with perfect colour rendering capacity you may still need to replace it after only about 10,000-12,000 (CRI 100), since it has a continuous spectral distribution that is hours. Depending on the tube's quality, these characteristics may not fragmented like fluorescent light is. This is another reason be more or less pronounced. FL can be divided into three groups: why some of us believe incandescent light to be healthier. * Class III: The basic halophosphate group includes the stan- dard cool-white tubes with - . tg ae ge vapmas moderate colour-rendering Eworiples of spectad power dissilaution cases fests feos pe prced daeht sosenoes. capacity (CRI 60-76), and the Drawer thom Chararo chars with pormisaion warm (pink) tubes of even poorer quality (CRI around ETT Sy Bao ‘Aa tore, _ftvheblusomenyellowehenne ted 50). These produce a bleak i i light that distorts colours, since i : they only reproduce some of ‘ : the wavelengths of the spec- i i trum. They have until recently 1 i been the most commonly used 1 i tubes, and in many countries ! H still are, despite the fact that they are not even very econom- ical to use. baueidesacut bua Takia] dayight fexarple} * Class II: Tri-phosphor or CURL EDAD #2 FOR, | RI 06 GETK qresy carey three-band FL, including the new slim tubes with improved Corot FF efficiency and the compact flu- i orescent, have better colour rendering (CRI 82-85) and usually come in warm to cool- white. They are gradually replacing the class III as the new standard tubes. * Class I: Multi-phosphor or full-spectrum (FSFL) tubes and compact fluorescents usually Web phestgediey clan Uf F. tobe Vaal sqageqrony ehace. F 1. robe come in daylight colour only LARA R PRE ES SHOT. but some make them in warmer PTA KS | SOOT, baarewhaiey CRE GT 26, 550K. (dayligtes hues as well. These FSFLs have five phosphors, giving their light better spectral distri- bution and colour rendering (CRI 90-98)—although mainly in a fairly superficial way, since, like tri-phosphor FL, it is still a composite light. But just as you may produce an alloy that looks like silver or gold by mixing several non-precious Thigh prossury sodham HIE lamp Metaitatice HIE amp metals, this does not make it TEALCINE Dawe CRU ASE POWER TAB Heda silver or go nor give it the 7 . 1 . . ope ome . same properties, of course. CREO f 220K fare} CRE 27 3, | BD-G000KR ftuviihitt prep The term full spectrum is really a misnomer. The only whiter), the colour of the light is determined in incandescent lamps by the temperature of the tungsten filament (which is around 2,700 K in GLS bulbs and up to 3,300 K in halogen lamps). In fluorescent and HID lamps, the colour and SPD are produced by the different colours of the phosphors and/or gases they contain (which, when added together in various combina- tions and proportions, appear to the eye as white, orange-white, pink-white or blue-white light) and the CCT that each colour type is designated is the one it visually most closely resembles. The temperature scale for light is often divided into four groups: 1,700-2,900 K is called "warm"; 2,900-3,300 K, "warm-white"; 3,300-5,000 K, "cool-white"; and 5,000-10,000 K, "daylight". All incandescent lamps, including halogen, produce a top- quality golden-white light with perfect colour rendering capacity (CRI 100), since it has a continuous spectral distribution that is not fragmented like fluorescent light is. This is another reason why some of us believe incandescent light to be healthier. Eworiples of spectad power dissilaution cases fests feos pe prced daeht sosenoes. Drawer thom Chararo chars with pormisaion Pai a eC _ftvheblusomenyellowehenne ted baueidesacut bua CR] EO § 706K Gan) adel dasetght fexaraele} (7A G0 GS0ETE (may raed Web phestgediey clan Uf F. tobe LARA R PRE ES PTA KS | SOOT, baarewhaiey Vaal sqageqrony ehace. F 1. robe ELECT LE Fhigh pressure scdham HS lamp WRAL PL i CR CREO ! 200K faa Motaitatice WIE) amp Pea eS ok bepit is COREG! 3, 1SR-000K (duytiahth 36 = NEXUS APRIL — MAY 2003 CRE GT 26, 550K. (dayligtes www.nexusmagazine.com