The spectrophotometer can accurately measure the intensity distribution of light within different wavelength ranges, providing strong support for analyzing light source characteristics and evaluating lighting effects. However, due to its high sensitivity and complex working principle, a series of operating procedures and precautions need to be strictly followed during use to avoid errors and extend the service life of the instrument.

Preheating and calibration of spectral radiometer equipment:

（1） The importance of sufficient preheating

Before use, it is necessary to give the radiometer sufficient preheating time. This is because the photoelectric sensors and other electronic components inside the instrument need to reach a thermally stable state in order to function properly. It is usually recommended to operate according to the manufacturer's specified preheating time, which is generally not less than half an hour. During the preheating process, it can be observed that the reading gradually stabilizes, indicating that the equipment is ready for accurate measurement. If the preheating step is skipped and measurement is started directly, it may result in high or unstable readings in the initial stage, affecting the accuracy of the final result.

（2） The necessity of regular calibration

To ensure the accuracy of measurement results, the radiometer should be calibrated regularly. A standard light source can be used as a reference benchmark to compare the measured values of the instrument and adjust the gain or other relevant parameters to make them consistent. The calibration frequency depends on the usage frequency and environmental conditions, but a comprehensive calibration should be conducted at least once a year. In addition, when the instrument is re used after transportation, vibration, or prolonged disuse, it also needs to be recalibrated to ensure its performance meets the requirements.

Control of measurement environment for spectrophotometer:

（1） Avoid stray light interference

When measuring, it is advisable to choose a dark room or a well shaded environment to prevent external stray light from entering the detector and affecting the measurement results. Even weak ambient light can cause significant interference to high-precision measurements. Unnecessary light can be blocked by setting up black tents, using light shields, and other methods. At the same time, pay attention to checking for reflective objects around, such as white walls, metal surfaces, etc., which may reflect light onto the detector and cause abnormal readings.

（2） Maintain a constant temperature and humidity

The changes in environmental temperature and humidity can affect the performance and measurement accuracy of the instrument. Ideally, measurements should be taken under constant temperature and humidity conditions. If it is not possible to achieve a fully controllable environment, it is also necessary to minimize the fluctuation range of temperature and humidity as much as possible. Extreme temperatures may cause material expansion and contraction, altering the focal length of optical systems; High humidity may cause electrical components to become damp, short-circuit, or corrode. Therefore, it is best to record the temperature and humidity conditions before and after use, so that the potential impact of these factors can be considered in subsequent data analysis.