Product Information :

	Light source	Applications	C.R.I.	Color temperature	Brand	Origin
daylight is recognized by CIE	D65	VeriVide D65  “Artificial Daylight”. Within the tolerances prescribed in BS 950: Part 1; Specified for most applications where there is a need to maintain color consistency and quality. Conforming highly to the CIE specifications, for accurate color matching.	98	6500K	VeriVide	EEC
	D75	VeriVide D75, Artificial light. Conforming to the USA ASTM (American Society for Testing and Materials) D1729-82 standard for D75 Illuminant. With high CIE specifications, for accurate color matching.	96	7500K	VeriVide	EEC
	D50	D50,artificial light. For the Graphic Technology and Photography industries. D50 lamps conform to BS 950: Part 2 and ISO 3664. Recommended for transmitted light source to view transparencies and for the reflected light source to view reproductions.	98	5000K	Philips	Holland
A light is recognized by IEC	F	Tungsten Filament Lighting. Required by BS 950: Part 1 as a test for metamerism (approxiamating CIE Illuminant ‘A’). Typical light source used within domestic environments. For materials containing red and yellow dyes are particularly important.	100	2300K to 2800K	GE	Hungary
	A	Tungsten Halogen Lighting (CIE Illuminant ‘A’). This represents incandescent A (inc-A). Typical light source used within domestic environments. Used to check for metamerism. This source is only available in model CAC60-N7	98	2856K
Other light (florescent) source	TL840	Narrow Band Triphosphor Fluorescent Lamps. CIE Illuminant F11. Often chosen as a European “Point of Sale” light source, with good colour rendering	85	4000K	Philips	Poland
	TL840/P15	Narrow Band Triphosphor Fluorescent Lamps.  CIE Illuminant F11. Often chosen as a European “Point of Sale” light source, with good colour rendering and manufactured to a tighter tolerance 15% specification as prescribed by Marks & Spencer.	85	4000K	Philips	Poland
	CWF	Cool White Broad Band Fluorescent Lamps. Used as an American “Point of Sale” light source. Moderate colour rendering.	62	4150K	Sylvania	Germany
	U30	Ultralume Narrow Band Triphosphor Fluorescent Lamp.  Often chosen as a European “Point of Sale” light source with good colour rendering.	85	3000K	Philips	USA
	TL830	Narrow Band Triphosphor Fluorescent Lamps. Often chosen as a European “Point of Sale” light source, with good colour rendering	85	3000K	Philips	Holland
Horizon Lighting	H	Horizon light, used for Automotive, Apparel and Metamerism Testing. As specified by the ASTM (American Society for testing and Materials) D1729-74, Standard Practise for Visual Evaluation of Colour Differences of Opaque Materials. This source is only available in model CAC60-N7	98	2300K
	UV	Ultraviolet Blacklight. Used to detect the presence of Optical Brightening Agents and/or Fluorescent dyes. Therefore it is useful when assessing white and Fluorescent shades to check the level present and its evenness.	-	-	Sylvania	Japan

To understand light sources, two factors need to be taken into consideration:
1.    COLOUR TEMPERATURE - expressed in Kelvin. (K)
Color temperature describes the color appearance of the lamp itself and the light it emits and can vary along with its spectral power distribution. “Correlated” color temperature applies to fluorescent lamps and approximates the true color temperature.
·       Lamps with lower color temperatures appear warmer
·       By comparison, lamps with a higher color temperature look bluer
2. COLOUR RENDERING INDEX (CRI)
A numerical system that measures how well colors are rendered by a lamp in comparison to a reference light source. The CRI is measured on an index from 0-100, with 100 representing an exact match, whilst low values indicate poor color rendering.