First, the test tool
Ultimate lighting passport smart spectrometer (left)
The characteristics of the instrument, a brief introduction to two aspects (for details, please pay attention to the next issue of "Light Play Technology"):
1, small and portable, intelligent interconnection, Bluetooth 4.0 and intelligent terminal connection, mobile phone app is click and test immediately.
2. Accuracy:
Second, the test method
When the subway passes underground (tested when the light rail line enters the station, reducing the impact of ambient light), hold the spectrometer, align the strips in the subway car, and click on the measurement.
Third, the test data
Parameter interpretation:
1. Color rendering characterizes the ability of the light source to restore the color of the object, out of 100. The higher the value, the stronger the reducing power.
2, R1--R15 distribution characterizes the color reproduction ability of the light source for 15 standard color blocks, such as R9, which is the display ability for saturated red. The higher the R9, the better the skin color of the person.
Among the 14 Beijing subway lines, Line 4 uses a neutral white temperature, red color R9 and general color rendering index CRI are the highest, Changping line color temperature is warmer, and other lines use a cool white light that looks brighter. .
The general color rendering index of Changping line has the lowest CRI, and the special color rendering index also has multiple negative values. Let's take a look at its spectrum, it is not difficult to understand:
The wonderful Yizhuang line, the color temperature value is as high as 10070K!
Parameter interpretation: Light is a kind of wave, the light wave distribution of visible light is 380-780nm, and the peak wavelength is the maximum value of the power distribution of the source spectrum. In general, the closer the spectrum is to sunlight, the more natural the light.
We can note the peak wavelength and dominant wavelength values ​​in the above table.
The same color temperature and color coordinates are different, and the human eye will feel different. Overall, the LED lamps in the Beijing subway cars are generally more blue.
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