White LED MR lamps can be manufactured with different colour temperatures, normally ranging from warm whites, attempting to match the colour of halogens, all the way through to cool whites at 5500 K or more.
22.
"' Amber shift "'is a phenomenon of incandescent lamps in which the perceived warmth ( or colour temperature ) of the light sources changes as larger amounts of electric current flow through it.
23.
From what I can tell from my searches, the latter is simply taking into account the colour temperature of the light from the sun, e . g . if you have a ray shining into your room.
24.
Scandium and sodium are used in some types, thallium, indium and sodium in European " Tri-Salt " models, and more recent types use dysprosium for high colour temperature, tin for lower colour temperature.
25.
Scandium and sodium are used in some types, thallium, indium and sodium in European " Tri-Salt " models, and more recent types use dysprosium for high colour temperature, tin for lower colour temperature.
26.
For example, everything else being equal, cool coloured fluorescents ( cool daylight for example ) generally have better colour rendition ( see colour rendition index ) then warm ones . ( The phosphors uses makes a big difference however whatever the colour temperatures ).
27.
The inner walls of the tube are coated with a thin layer of fluorescent substances, which, when they are excited by the 253.7 nm line of UV radiation from a mercury arc, emits visible light, usually in the range of 6500K ( daylight ) colour temperature.
28.
However, the appearance of objects illuminated by that light may vary as the spectrum varies, this is the issue of Colour rendition, quite separate from Colour Temperature, where a really orange or cyan object could appear with the wrong colour and much darker as the LED or phosphor does not emit the wavelength.
29.
Depending on the type of plant being cultivated, the stage of cultivation ( e . g . the germination / vegetative phase or the flowering / fruiting phase ), and the photoperiod required by the plants, specific ranges of spectrum, luminous efficacy and colour temperature are desirable for use with specific plants and time periods.
30.
Note also that the Western colour temperature preference is'hotter'( i . e . a lower temperature ) then daylight ( although closer to traditional artificial sources like incandescent light bulbs and fire ) so I would question whether either colour preferences could emperically be called'natural'Nil Einne 11 : 53, 26 June 2007 ( UTC)
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