Spectral Colour Measurement & Colourimetry
Measure colour beyond visual appearance.
ColourLight Standards Lab
Advanced Colour Science, Spectral Measurement & Lighting Quality
Independent expertise in colour measurement, illuminant metamerism, spectral analysis, printing and reproduction quality, visual perception, pigments and museum lighting.
We help organisations understand, measure and control how colour changes across materials, printing processes, lighting conditions and human visual perception.
From spectral measurement and ΔE colour difference analysis to metamerism assessment and TM-30 lighting evaluation, ColourLight Standards Lab transforms complex colour behaviour into measurable and actionable technical decisions.
Where Colour, Light and Material Meet
Colour cannot be evaluated independently from light, material and perception.
A colour may appear correct under one illuminant and significantly different under another. Printed reproductions, pigments, artworks, packaging and industrial materials can therefore require more than a conventional colour measurement.
ColourLight Standards Lab integrates spectral measurement, colourimetry, metamerism, lighting quality, visual perception and graphic reproduction to provide a more complete understanding of colour performance.
Our Core Expertise
COLOUR
- •Spectral reflectance
- •CIELAB colour measurement
- •Colour difference
- •ΔE analysis
- •Colour tolerance
LIGHT
- •Spectral Power Distribution
- •CCT
- •CRI
- •TM-30
- •Rf / Rg
- •Illuminance
METAMERISM
- •Illuminant metamerism
- •Metamerism Index
- •Multi-illuminant comparison
- •Colour mismatch investigation
PERCEPTION
- •Visual colour evaluation
- •Observer assessment
- •Instrumental vs perceptual comparison
REPRODUCTION
- •Printing
- •Graphic reproduction
- •Grey balance
- •Colour fidelity
- •Colour management
MATERIALS
- •Pigments
- •Paintings
- •Printed materials
- •Packaging
- •Industrial surfaces
Why ColourLight Standards Lab?
Interdisciplinary Expertise
We connect colour science with lighting, printing, materials and visual perception rather than evaluating each field in isolation.
Spectral Approach
Colour is investigated through the interaction of material reflectance and the spectral characteristics of illumination.
Instrument + Observer
Instrumental results can be compared with controlled human visual evaluation where appropriate.
Research-Based Methodology
Our methodology is informed by doctoral research in illuminant metamerism, graphic reproduction and colour perception.
Independent Assessment
We provide technical interpretation based on measurable colour and lighting parameters.
Specialised Expertise
Our focus lies in complex colour problems where conventional visual comparison alone may not provide sufficient information.
About the Expert
Meet the Expert
Dr. Sci. Albulena Bilalli — Colour Scientist | Graphic Technology & Colour Reproduction Specialist | Researcher in Illuminant Metamerism and Lighting Quality
Dr. Sci. Albulena Bilalli is the founder and scientific lead of ColourLight Standards Lab. Her interdisciplinary expertise connects colour science, graphic technology, printing and reproduction, lighting, visual perception, artistic materials and illuminant metamerism.
She completed her doctoral research at the University of Zagreb, Faculty of Graphic Arts, within the field of Graphic Engineering and Graphic Product Design. Her doctoral dissertation, Illuminant Metamerism on Artistic Paintings, investigated how different painting techniques, printed reproductions and colour combinations behave under different spectral lighting conditions.
Her research combines instrumental colour measurement with controlled visual assessment, examining the interaction between: light source → spectral distribution → material → colour reproduction → metamerism → human perception.
The doctoral research evaluated artistic and reproduced colour samples under LED, tungsten and halogen lighting conditions and investigated colour fidelity using objective and subjective methodologies.
Her research experience also includes international academic and laboratory collaboration in Hungary, Germany and Central Europe in colour and lighting measurement. The dissertation records research cooperation with the University of Pannonia, LightingLab Veszprém, Óbuda University and ERCO-related research activities.
Her professional background extends to graphic production, printing quality and artistic practice, providing an interdisciplinary perspective that connects scientific measurement with real production and visual applications.
Colour ScienceIlluminant MetamerismSpectral Colour MeasurementCIELAB and Colour DifferenceTM-30 Colour RenditionVisual Colour PerceptionGraphic ReproductionPrinting QualityPigments and Artistic MaterialsMuseum and Gallery Lighting
Services
Ten specialist colour, lighting, printing and perception services for industry, heritage and research.
Colour Difference & Tolerance Analysis
From visible difference to measurable evidence.
Illuminant Metamerism Assessment
The same colour under one light does not always remain the same under another.
Lighting Quality & Spectral Power Distribution
Light is part of every colour measurement.
Museum & Gallery Lighting Assessment
Balancing visual fidelity, artwork presentation and lighting conditions.
Printing & Graphic Reproduction Quality
Scientific colour control from original to reproduction.
Colour Management & Calibration
Build consistent colour across devices and production workflows.
Pigment & Material Colour Characterisation
Understand how materials interact with light.
Visual Colour Perception & Observer Studies
Instrumental measurement and human vision do not always tell the same story.
Independent Technical Colour Assessment & Expert Reporting
Independent technical evidence for complex colour problems.
Laboratory Capabilities
An interdisciplinary measurement framework combining spectral science, colourimetry, lighting evaluation, graphic reproduction and visual assessment.
Colour Measurement
- • Spectral reflectance
- • CIELAB
- • CIEXYZ
- • Chromaticity coordinates
- • ΔE*ab
- • CIEDE2000 / ΔE00
- • Colour tolerance analysis
- • Reference/sample comparison
Metamerism
- • Illuminant metamerism
- • Metamerism Index
- • Multi-illuminant evaluation
- • Spectral mismatch assessment
- • Lighting-dependent colour variation
Lighting
- • Spectral Power Distribution
- • CCT
- • CRI
- • TM-30
- • Rf
- • Rg
- • Colour Vector interpretation
- • Illuminance
- • Lighting comparison
Graphic Reproduction
- • Print/reference comparison
- • Grey balance
- • Halftone reproduction
- • Colour fidelity
- • Colour consistency
- • Print metamerism
- • Colour-managed workflows
Visual Assessment
- • Controlled viewing conditions
- • Observer-based evaluation
- • Visual colour matching
- • Instrumental/perceptual correlation
- • Colour perception protocols
Materials
- • Artistic paints
- • Pigments
- • Printed materials
- • Paper
- • Packaging substrates
- • Coated and coloured surfaces
- • Natural materials
Instruments are listed as laboratory capabilities only when they are actually available to ColourLight Standards Lab. Research experience with advanced measurement systems used during doctoral research is documented separately under Research & PhD Expertise.
Research Experience with Advanced Measurement Systems
Doctoral methodology may reference instruments and methods used in academic research. These are distinguished from the laboratory's current commercial measurement inventory to ensure transparent and accurate capability reporting for clients.
Industries We Support
Museums & Cultural Heritage
Colour and lighting evaluation for artworks, exhibitions, galleries and collections.
Applications
- • Museum lighting
- • Artwork colour fidelity
- • Metamerism
- • Exhibition lighting
- • Visual perception
Printing & Graphic Arts
Scientific colour control for commercial, specialised and high-value printing.
Applications
- • Print quality
- • ΔE tolerance
- • Grey balance
- • Colour reproduction
- • Metamerism
- • Colour management
Packaging
Consistent brand and product colour across materials, printing processes and lighting conditions.
Applications
- • Brand colour
- • Batch comparison
- • Packaging metamerism
- • Supplier quality
- • Reference/sample evaluation
Lighting & Architecture
Spectral and colour-rendering analysis of lighting systems.
Applications
- • SPD
- • TM-30
- • CRI
- • CCT
- • Colour fidelity
- • Material appearance
Paints, Pigments & Materials
Spectral and colourimetric characterisation of coloured materials.
Applications
- • Pigment comparison
- • Material colour
- • Metamerism
- • Colour stability
- • Research
Manufacturing
Independent colour measurement for colour-critical industrial products.
Applications
- • Production quality
- • Batch consistency
- • Supplier verification
- • Colour tolerance
- • Technical disputes
Design & Creative Industries
Technical colour support where creative intent must be translated into repeatable production.
Applications
- • Material selection
- • Colour specification
- • Print reproduction
- • Lighting
- • Prototype evaluation
Research & Academic Institutions
Experimental design and specialist collaboration in colour science and visual research.
Applications
- • Colour measurement
- • Observer studies
- • Research protocols
- • Lighting experiments
- • Metamerism research
- • Data interpretation
Research & PhD Expertise
Illuminant Metamerism on Artistic Paintings — University of Zagreb, Faculty of Graphic Arts
ColourLight Standards Lab is scientifically grounded in doctoral research investigating one of the most complex relationships in colour science: How does the spectral composition of light change the appearance and perception of colour?
The research investigated illuminant metamerism across different artistic painting techniques and colour reproductions under different lighting conditions. The experimental framework included Tempera / Gouache, Oil, Acrylic, Watercolour and Pastel together with graphic colour reproductions evaluated under several lighting conditions.
The dissertation describes comparison of these techniques under LED 3000 K, 4000 K and 6500 K, tungsten/Wolfram and halogen conditions.
01
Illuminant Metamerism
Investigation of colour mismatch caused by changes in spectral illumination.
02
Spectral Power Distribution
Analysis of how the spectral structure of light influences colour appearance.
03
Colourimetry
Objective colour specification and comparison using established colour spaces and colour-difference methods.
04
Colour Perception
Investigation of the relationship between instrumental colour values and human visual response.
05
Graphic Reproduction
Evaluation of colour fidelity between original artistic material and printed reproduction.
06
TM-30 Colour Rendition
Evaluation of light-source fidelity and gamut behaviour beyond conventional CRI.
07
Museum Lighting
Research into lighting conditions that support appropriate visual presentation of artworks.
08
Pigments & Painting Techniques
Investigation of how material composition and painting technique influence spectral and perceptual behaviour.
Scientific Approach — From Spectrum to Perception
LIGHT SOURCE
SPD
MATERIAL / PIGMENT
SPECTRAL REFLECTANCE
CIELAB / ΔE
METAMERISM INDEX
VISUAL OBSERVER
COLOUR FIDELITY DECISION
4. Metamerism
4.1 Definition of Metamerism
Metameric colour stimuli are colour stimuli with the same tristimulus values but different spectral power distributions. An equivalent definition states that metameric colour stimuli are colour stimuli that have different spectral radiant power distribution but match in colour for a given observer. Metameric colour stimuli are often referred to as metamers, and the underlying concept is referred to as metamerism.
Metamerism occurs when the colour of two objects appears the same under a specific light source but has different spectral power distributions. The colour difference may be seen when a different type of light source is used. Metameric objects reflect stimuli of different SPD that produce the same colour under the same viewing conditions.
4.1.1 Metamerism fields
According to Wyszecki (1985), there are four types of metamerism:
- Illuminant Metamerism
- Observer Metamerism
- Geometric Metamerism
- Field-size Metamerism
5. Colour Mixing
5.1 Additive and subtractive colour generation
There are two modes of colour generation that are important to distinguish and analyse: additive and subtractive colour generation. In daily life, an additive colour model is used for television sets or flat panel displays, where three primary colours red, green, and blue are added in different quantities.
6. Colourimetry
The objective description of the physical correlates of colour perception is the subject of colourimetry. Coloured samples were used first; physicists developed techniques for comparing coloured lights directly to reference lights. Many colour specification systems and colour differences have been proposed to improve correlation between colour measurement and visual perception.
Modelling human perception of colour is the aim of colourimetry. Colourimetry focuses on matching colours and predicting small colour differences when two stimuli are not matching. Colourimetric data alone do not specify what colour can be seen.
7. Light in Museums and Galleries
7.1 Museum lighting
Two main issues in museum lighting are preserving artworks from damaging light effects and providing the best visual impression to visitors through adequate light sources. Museums place objects according to sensitivity to light and luminance levels. Lighting technology enables flexibility in luminance levels, correlated colour temperature and colour rendering properties — all significantly impacting visitor visual impression.
Effects of illuminant metamerism on artistic paintings
Not all light is the same: under warm sunset light colours look different compared to cool overcast daylight. Research suggests choosing correct illumination for painted subjects; yellow and red are warm, bluish-white is cool.
Quality & Scientific Integrity
Transparent, traceable and scientifically defensible colour assessment.
- ✓Controlled measurement conditions
- ✓Documented methodology
- ✓Reference-based comparison
- ✓Repeatable procedures
- ✓Instrumental data
- ✓Visual evaluation where applicable
- ✓Clear distinction between measured results and technical interpretation
- ✓Transparent reporting of measurement limitations
We do not claim analytical certainty where the available measurement method does not support it.
Let's Solve Your Colour Problem
Colour differences can originate from the material, the printing process, the light source, the observer — or the interaction between all four.
Tell us what you are experiencing and we will determine the appropriate measurement and evaluation approach.
Contact ColourLight Standards Lab
Email: colourstandardslab@outlook.com
Areas of Consultation
- • Colour measurement
- • Metamerism
- • Printing
- • Pigments
- • Lighting
- • Museum environments
- • Colour reproduction
- • Visual assessment
- • Technical colour disputes
- • Research collaboration
Meet the Expert
Dr. Sci. Albulena Bilalli
Founder & scientific lead · Illuminant metamerism, spectral measurement, graphic reproduction & museum lighting
ColourLight Standards Lab is led by a colour scientist whose doctoral research investigated how painting techniques and reproductions behave under different lighting — combining instrumental measurement with controlled visual assessment.
About the Expert