The picture below is the spectrum of a mercury argon lamp and a candescent lamp. Common candescent lamp consists of mercury argon lamp plus phosphor. Common candescent lamp is a pretty handy object to testify the accuracy of spectrometers. Process: Use the spectrometer to test the candescent lamp and make sure if wavelengths at 404.656nm, 435.833nm, 546.076nm are accurate. If the wavelengths are not right, that means the spectrum is not accurate which will lead to miscalculation of lumen, color temperature.
Someone provides us with a case for a portable LED verification instrument with touch panel (item#XX-350). We’d like to share you this case and make a simple comparison of the accuracy of the results are as follows: the accurate peak wavelength (lambda P) of general fluorescent lamp is located in 435.833nm, but if the light intensity of LED measuring instrument do not be calibrated, then the peak wavelength (lambda P) is located in 546.074nm. (If the correction of light intensity didn’t be done, color rendering (CRI), temperature (CCT), color coordinates, luminous flux... Wait for measured values… can not be calculated.)Please refer to the right illustration about the testing results measured by the Rainbow-Light portable LED measuring instrument: checking peak wavelength (lambda P) value of 435.8nm, 435.833nm, 546.074nm and 404.656nm, you can find the measured values of 404.852nm, 435.805nm, 545.673nm are very accurate.The portable LED measuring instrument XX-350 with the touch panel version is measured below: The peak wavelength (lambda P) value of 544nm (even if it is 545.673nm, spectral deviation is far more than 1nm), 404.656nm, 435.833nm measured, the spectral deviations are more than 6nm. Thus, the portable LED measuring instrument XX-350 is unable to measure color rendering (CRI). Color temperature (CCT), color coordinates, luminous flux....accurately.