MULTILIGHT COLOUR CABINET

ITEM 36

COLOUR ASSESSMENT CABINETS

Multilight Colour Cabinet offers immediate colour viewing in consistent, controllable lighting conditions. CACs instantly remove problems caused by the variability of natural daylight, and are a highly cost-effective way to ensure colour accuracy and product quality.

  • Meet or surpass ISO 3664 and BS 950 Part 1.
  • Available with a choice of light source, customised to your needs – (see LAMP OPTIONS AND PAINT)
  • 3 widths: 60, 120 and 150cm.
  • Incorporate advanced features include servicing indicator, auto sequence, warm-up, power save and data storage facility.

That Cabinet range provide the best fluorescent D65 daylight simulator, with the highest Colour Rendering Index (CRI), available to the colour viewing world.

They are known by many names in different businesses, such as light boxes, viewing booths, colour cabinets, and are used within a wide array of industry sectors throughout the world including textile and apparel, leather, graphics, automotive, ceramics, cosmetics, food, footwear, packaging and printing.
4-light source
CACs can accommodate up to 4 light sources. The light sources can be specified by you, to meet your needs and requirements. A typical cabinet includes UV and F with a choice of two other light sources – usually D65 and one ‘point of sale’ light source such as 840, 830 or Cool White. If required A or H can be supplied instead of F.

5-light source
CAC -5 range can accommodate up to 5 light sources. You can determine the light sources to meet yours and your customers’ requirements and standards. A CAC -5 cabinet could typically include D65, UV and F with a choice of two other light sources – usually ‘point of sale’ light sources such as 840, 830 or Cool White. If required A or H can be supplied instead of F.

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. Multilight Colour Cabinet 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.
  1. 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).
Cabinet 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.

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.

 

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