In the textile dyeing and printing industry, color accuracy is one of the most important factors for dye houses, fabric manufacturers, and brand customers. The same dye formulation may show different colors under different lighting conditions. This phenomenon is why customers often require color evaluation under standard light sources such as D65, TL84, and A light.

To avoid metamerism and improve color consistency between production batches, textile companies usually use standard light booths (such as VeriVide, Datacolor, X-Rite, etc.) for color assessment.

This article introduces the commonly used standard light sources in the textile industry, their applications, and key concepts related to color evaluation.

1. What Are Standard Light Sources?

A standard light source is an artificial light source with a defined spectral power distribution, designed to simulate natural daylight or different commercial lighting environments.

In textile color evaluation, the most commonly used light sources include:

• D-series daylight sources (D65, D50, D75)

• TL series fluorescent lamps (TL84, TL83)

• CWF (Cool White Fluorescent)

• A Light Source (Incandescent/Tungsten Halogen)

• UV Light Source

Different light sources have different color temperatures and spectral characteristics, which can influence human perception of color.

2. Common Standard Light Sources Used in Textile Industry

3. The Three Most Important Light Sources in Textile Color Evaluation

3.1 D65 – Standard Daylight Source

D65 = 6500K simulated average daylight

D65 is one of the most widely used light sources in textile color assessment.

Main applications:

• Dye house color approval

• Fabric color inspection

• Laboratory color matching

• International customer approval

For example, customers may request:

Color should be checked under D65 light.

This means the color must be evaluated under a D65 standard light source.

3.2 TL84 – Commonly Used in Europe and Asia

TL84 simulates the lighting conditions of European shopping malls and offices.

Main applications:

• European customer inspection

• Garment brand color approval

• Commercial textile display evaluation

For example:

The same black fabric may appear:

• Slightly bluish under D65

• Slightly reddish or yellowish under TL84

Therefore, many European brands require:

D65 + TL84 dual light source evaluation.

3.3 A Light Source – Indoor Warm Lighting

A Light Source:

2856K warm light

It simulates:

• Household lighting

• Retail spotlight environments

• Indoor display lighting

Dark shades such as:

• Black

• Navy blue

• Dark purple

• Dark brown

are more likely to show color differences under A light.

4. What Is Metamerism?

Metamerism is a very important color issue in the textile industry.

Simply explained:

Two colors may look identical under one light source but appear different under another light source.

Example:

Two black fabrics:

Under D65:

✅ Both appear black

Under TL84:

❌ One appears reddish, another appears greenish

The reason is that although the visual colors are similar, the spectral reflectance curves of the dyes are different.

5. Why Does Metamerism Occur in Textile Dyeing?

5.1 Different Dye Combinations

Many shades, especially black colors, are not made from a single dye.

They are usually combinations of:

• Blue dyes

• Red dyes

• Yellow dyes

Different dye combinations can produce similar colors under one light source but different results under another.

5.2 Different Fiber Materials

The same dye formulation may behave differently on:

• Cotton

• Polyester

• Nylon

• Blended fabrics

because different fibers have different light reflection properties.

5.3 Influence of Finishing Processes

Fabric finishing can also affect color appearance, including:

• Softener treatment

• Silicone finishing

• Resin finishing

• Optical brightener treatment

6. How Can Textile Companies Avoid Color Problems?

6.1 Use Standard Light Booths

Recommended minimum configuration:

• D65

• TL84

• A Light

For export markets, additional light sources are recommended:

• CWF

• UV

6.2 Evaluate Colors Under Multiple Light Sources

Do not judge colors under only one lighting condition.

Recommended light sources:

6.3 Maintain Dye Formulation Stability

Special attention should be paid to:

• Black dyes

• Deep blue dyes

• Dark green dyes

• Navy shades

These colors are more likely to show metamerism.

7. Conclusion

In the textile dyeing industry, color evaluation is not simply about whether two colors "look the same". It requires scientific evaluation under controlled lighting conditions.

The key light sources include:

• D65: The most widely used standard daylight source

• TL84: Common commercial lighting source in Europe and Asia

• A Light: Warm indoor lighting simulation

• UV: Used for fluorescent effects and optical brightener inspection

• CWF: Common US commercial lighting source

Understanding different light sources helps dye houses reduce color complaints, improve first-time dyeing success rates, and maintain consistent product quality.

For dye manufacturers and textile companies, establishing a proper light management system is essential for achieving stable colors and improving customer satisfaction.