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Lamp options and paint

Lamp options and paint

Often, colours need to be assessed using more than one light source in order to replicate different viewing environments. The need for different light sources becomes apparent when, for example, consumers complain that a product ‘looked different when we got it home’.  

When two or more materials match visually under one illuminant but mismatch under another, the inconsistency is termed metamerism. It is most usually caused by differences in the colouring matter used for each material. If only one light source is used for colour assessment, metamerism can easily slip through the net with the potential to cause problems at the consumer interface.

The following table of VeriVide lamps for viewing cabinets covers all supply chain viewing conditions, including the specific requirements of individual major retailers.

 Retailers have differing specifications for the lamps and grey used in the Colour Assessment Cabinets. 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 considered:

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.
  • 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.

  • Therefore 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).


VeriVide servicing

It is important to have your cabinet regularly serviced - a non-serviced lightbox is incompatible with successful accreditation. A cabinet needs servicing when:

  • It was bought more than a year ago and has not been serviced in that time.
  • The lamps have completed their 2000-hour life cycle. After that time the spectral output of the lamps will change, resulting in assessment inaccuracies.

Without a regular service the build-up of dirt will also discolour both the interior paint and lamps, distorting reflective light and spectral output. This matters because if uncorrected it will make colour decisions unreliable and inconsistent, potentially causing problems in the supply chain. 

VeriVide recommend that lamps are replaced every 2000 hours or annually to ensure that their colour matching properties are maintained as these properties reduce with time and use even though the lamps continue to illuminate.

For any additional information, please contact VeriVide 

Quick Quote

Lamp specifications:
 

CIE Daylight Illuminants
Light Source Name Lamp Description C.R.I. Length Watts Diam Product Code
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 600D75
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
18w
36w
58w
T8
T8
T8
600D65
1200D65
1500D65
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 600mm
1200mm
1500mm
18w
36w
58w
T8
T8
T8
60095
120095
150095

 

CIE Illuminant 'A'
Light Source Name Lamp Description C.R.I. Length Watts Diam Product Code
'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
-
-
-
40G450
60G450
150FILO
28460CL
28460OP
'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 - HALO/12V
/35WLP

 

Alternative (fluorescent) lighting / Point of Sale
Light Source Name Lamp Description C.R.I. Length Watts Diam Product Code
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
60084P15
120084P15
150084P15
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
60033
120033
150033
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
T8
600U35
1200U35
830 830 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
36w
58w
T8
T8
T8
60083
120083
150083

 

Horizon
Light Source Name Lamp Description C.R.I. Length Watts Diam Product Code
'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 - HALO/12V
/75W

 

Ultraviolet
Light Source Name Lamp Description C.R.I. Length Watts Diam Product Code
UV Ultraviolet 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. N/A Clear-450mm
Blacklight-600mm    
15w
18w
T8
T8
450UV15
600UV18

 

Paint specification

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

 

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