Equiptex
The World's largest stock of textile testing machinery

Technical details  

LAMP OPTIONS etc.
With today’s complex colour requirements, a shade cannot always be assessed under one light source. Several may be needed so that the shade is viewed in applicable conditions, i.e. ‘Artificial Daylight’ and ‘Point of Sale’ Light.
This allows inconsistencies such as metamerism to be detected. When two coloured materials have identical spectral reflection curves, they will match visually under any illuminant. However, it is possible for two materials to match visually under one illuminant but mis-match under another, such matches are termed ‘metameric’.
How often have we heard the dissatisfied phrase, “The colour looked totally different in the shop!”. Well, that’s metamerism in action. Metamerism is the term used when two materials match visually under one light source but mismatch under a different light source.
This is usually a result of the colouring matter used in each material being different. With these factors influencing colour appearance it is important to standardise viewing conditions, especially for commercial use.
Please note individual retailers have differing specifications for the lamps and paint used in the Colour Assessment Cabinets, please check before ordering .
VeriVide equipment provides these conditions for all applications. For consistency, the source of light must be controllable and constant. To understand light sources, two factors need to be taken into consideration:
1. COLOUR TEMPERATURE - expressed in Kelvin. (K)
Colour temperature describes the colour appearance of the lamp itself and the light it emits and can vary along with its spectral power distribution. “Correlated” colour temperature applies to fluorescent lamps and approximates the true colour temperature.
Lamps with lower colour temperatures appear warmer i.e. red/orange and typical examples would be illuminant A and 830.

By comparison, lamps with a higher colour temperature look bluer, and examples would include the VeriVide D65 and D75.
2. COLOUR RENDERING INDEX (CRI)
A numerical system that measures how well colours 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 colour rendering.
Hence a lamp rated with a CRI of 98 such as the VeriVide D65 will show colours more accurately than a lamp with a CRI rating of 62 such as the CWF.

This rating method is recognised by the Illuminating Engineering Society (IES) and the Commission International de L’Eclairage (CIE).
Our full list of available lamp options are detailed below.

 

CIE Daylight Illuminants
Light Source	Name	Lamp Description	C.R.I.	Length	Watts	Diam
D75	VeriVide D75 "Artificial Daylight".	Correlated colour temperature 7500K. Conforming to the USA ASTM (American Society for Testing and Materials) D1729-82 standard for D75 Illuminant. With high CIE specifications, for accurate colour matching.	96	600mm	20w	T12
D65	VeriVide D65 "Artificial Daylight".	VeriVide D65  “Artificial Daylight”.   Correlated colour temperature 6500K. Within the tolerances prescribed in BS 950: Part 1; and all international specifications for D65 illluminant. Specified for most applications where there is a need to maintain colour consistency and quality. Conforming highly to the CIE specifications, for accurate colour matching.	98	600mm 1200mm 1500mm	20w 40w 65w	T12 T12 T12
D50	D50 "Artificial Daylight."	Correlated colour temperature of 5000K. 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	450mm 600mm 1200mm 1500mm	15w 18w 36w 58w	T8 T8 T8 T8

 

CIE Illuminant 'A'
Light Source	Name	Lamp Description	C.R.I.	Length	Watts	Diam
'F'	Tungsten Filament	Tungsten Filament Lighting. Approximate colour temperature of 2800K. Required by BS 950: Part 1 as a test for metamerism (approxiamating CIE Illuminant ‘A’). Typical light source used within domestic environments.	100	Globe Globe Round Clear-284mm Opal-284mm	40w 60w 150w 60w 60w	45mm 45mm - - -
'A'	Tungsten Halogen	Tungsten Halogen Lighting (CIE Illuminant ‘A’). This represents incandescent A (inc-A) with a colour temperature of 2856K. Typical light source used within domestic environments. Used to check for metamerism.	100	-	35w	-

 

Alternative (fluorescent) lighting / Point of Sale
Light Source	Name	Lamp Description	C.R.I.	Length	Watts	Diam
840 P15	VeriVide 840P15	Narrow Band Triphosphor Fluorescent Lamps.   Correlated colour temperature of 4000K.  CIE Illuminant F11. Often chosen as a European “Point of Sale” light source, with good colour rendering and manufactured to a tighter tolerance specification as prescribed by Marks & Spencer. (Formerly TL84P15)	85	600mm 1200mm 1500mm	18w 36w 58w	T8 T8 T8
CWF	Cool White	Cool White Broad Band Fluorescent Lamps. Correlated colour temperature of 4000K. Used as an American “Point of Sale” light source. Moderate colour rendering.	62	600mm 1200mm 1500mm	20w 40w 65/80w	T12 T12 T12
U35	Ultralume 35	Ultralume Narrow Band Triphosphor Fluorescent Lamp.Correlated colour temperature 3500K. An American “Point of Sale” light source, with good colour rendering.	86	600mm 1200mm	17w 32w	T8 T8
U30	Ultralume 30	Ultralume Narrow Band Triphosphor Fluorescent Lamp.   Correlated colour temperature 3000K.  An American “Point of Sale” light source, with good colour rendering.	85	600mm	20w	T12
830		Narrow Band Triphosphor Fluorescent Lamp.   Correlated colour temperature 3000K. Often chosen as a European “Point of Sale” light source with good colour rendering.(Formerly TL83)	85	600mm 1200mm 1500mm	18w 40w 65/80w	T8 T12 T12

 

Horizon
Light Source	Name	Lamp Description	C.R.I.	Length	Watts	Diam
'H'	Horizon Lighting	Colour temperature 2300K. 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.	98	-	75w	-

 

Ultra Violet
Light Source	Name	Lamp Description	C.R.I.	Length	Watts	Diam
UV	Ultra Violet	Ultra-Violet 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.	N/A	Clear-450mm Blacklight-600mm	15w 18w	T8 T8

 

PAINT (For Cabinet Interiors)
Name	Description	Quantity
Crown	Plain Grey 5574 Matt Emulsion	0.5 Litre Tins
Munsell	N5	0.5 Litre Tins
Munsell	N7	0.5 Litre Tins
Light Cabinet MAINTENANCE PACK
The  Light CabinetMaintenance Pack includes Cleaning Materials, Brush & Roller plus 0.5 litres of Paint. Please specify required paint colour when ordering

 

Equiptex SERVICE
It is important to have your cabinet regularly serviced.
Does your cabinet need a service?
YES - If you purchased it more than a year ago and you’ve not had it serviced.
YES - If the lamps have reached the optimum life-time of 2000 hours use, BEFORE the due time of the yearly service. After that time the spectral output of the lamps will change and will need to be replaced.
Without a regular service the build-up of dirt will also discolour both the interior paint and lamps, distorting reflective light and spectral output.

And why is that important?

Deterioration of the reflected light and a decline in quality of spectral output will make your decisions on examined product unreliable and inconsistent.

Your product colour matched against a standard may be incorrectly passed or incorrectly rejected - costing time, money and confusion in the supply chain. A non-serviced lightbox is also incompatible with a successful accreditation.