SEN0644 Very Low Ambient Light Measurements

Hello,

I had the SEN0644 interfaced to my computer through an RS-485 to USB serial adapter.  I was able to change the MODBUS address, and I was able to poll the sensor, but the ambient light measurements are much lower than expected.  I then interfaced the SEN0644 with an ESP32-S3 through an RS-485 bus that has a total of 4 MODBUS RTUs.  In a room with 5000K lighting, the SEN0644 was reading 0.002 lux, and jumped up to 0.029 lux with a blue light pointed at the sensor.  

modbus_sen0644: SEN0644: High-Word 0x0000 | Low-Word 0x001d | 0.029 lux

modbus_sen0644: SEN0644: High-Word 0x0000 | Low-Word 0x0002 | 0.002 lux

The sampling rate is once a minute.  Does the sensor have to be calibrated, or any other settings that should be configured to obtain nominal ambient light measurements?

Thanks