What are the methods for measuring color temperature?

The methods for measuring the color temperature of LED lamps mainly include spectral analysis method, comparative standard lamp method, thermal radiation thermometry method, digital camera method and color temperature meter method.

Spectrometry: Using a spectrometer to analyze the spectrum of a light source to determine its color temperature. This method requires a high-precision spectrometer and is suitable for areas such as laboratories and scientific research.
Comparing the standard lamp method: Put the light source to be measured and a standard lamp with a known color temperature together, and determine the color temperature of the light source to be measured by comparing the colors of the two. This method requires standard lamps and precise comparison technology, and is suitable for lighting manufacturers and quality inspection agencies.
Thermal radiation thermometry: Use an infrared thermometer to measure the thermal radiation of a light source to calculate its color temperature. This method requires measurement on the surface of the light source and is suitable for measurements of high-temperature light sources.
Digital camera method: Use a digital camera to capture an image of a light source, and then determine the color temperature of the light source by calculating parameters such as brightness, saturation, and hue of the image. This method requires high pixels and color reproduction capabilities of the camera, and is suitable for simple measurements in environments such as homes and offices.
Color temperature meter method: A color temperature meter is a portable instrument that can measure the color temperature of natural light and is commonly used in applications such as indoor lighting. The color temperature meter calculates the color temperature by measuring the color of natural light. Its principle is to calculate the color temperature of natural light based on the human eye's perception of the three primary colors of red, green, and blue.
It should be noted that different measurement methods have their applicable scenarios and limitations. Choosing the appropriate method can improve the accuracy and reliability of measurement.