How LED Luminous Flux and CCT Are Measured – Key Insights from a Trusted LED Manufacturer

Description:

• Discover how luminous flux and CCT are measured in LEDs. Learn the standard testing methods used by leading LED manufacturers to ensure product quality and performance.

Understanding LED Luminous Flux and CCT Measurement

• As a professional LED supplier with years of experience in manufacturing and global trade, we understand how crucial accurate testing is to LED quality. Two key parameters that buyers and engineers often look at when choosing LEDs are luminous flux and CCT (Correlated Color Temperature). Here’s how we—and the industry—measure them.

1. What Is Luminous Flux in LEDs?

Luminous flux refers to the total amount of visible light emitted by an LED source, measured in lumens (lm). It directly affects how bright the LED appears. 

How It's Measured:

1. Integrating Sphere: A highly reflective sphere that captures light in all directions.
2. Photometer or Spectroradiometer: Measures the light output from the LED inside the sphere.
3. Standards Used: Measurements are usually based on IES LM-79 and CIE 127 standards.

This method allows manufacturers to determine total output without being affected by beam angle or LED orientation.

2. What Is CCT (Correlated Color Temperature)?

CCT describes the color appearance of the LED light in kelvins (K), indicating whether the light appears warm (yellow-red) or cool (blue-white).

How It's Measured:

1. Spectroradiometer: Measures the LED's spectral power distribution.
2. CIE 1931 Chromaticity Diagram: The data is plotted to find the closest matching color temperature.

Common CCT Ranges:

2700K–3000K: Warm White

4000K–4500K: Neutral White

6000K–6500K: Cool White

3. Why These Measurements Matter to Buyers

• Product Consistency: Ensures batch-to-batch uniformity.
• Application Matching: Allows designers and engineers to select the right LEDs for display, signage, or lighting.
• Quality Assurance: Avoids customer complaints and supports compliance with international standards.

Our Commitment to Quality
We test all our LED products—including SMD LEDs, DIP diodes, flashing LEDs, and RGBW solutions—using calibrated equipment in a professional lab environment. We follow strict quality control procedures to deliver consistent, reliable performance.

Want to Learn More?
Visit our website or contact our sales team for datasheets, testing reports, or custom LED solutions tailored to your market.

To help customers better understand LED performance testing, the following are common keywords related to this topic:

LED luminous flux measurement, how to measure CCT, LED color temperature test, integrating sphere LED test, LED quality control, spectroradiometer for LEDs, LED testing standards, LED brightness measurement

Email: master@demophotech.com
Tel:+86 15312229119
Wechat/WhatsApp: +86 15312229119
Address: 2/F, Block D, Liye Building, University Science Park, No. 20, Qingyuan Road, Xinwu District, Wuxi, China, 214135.