How to measure light output with a Samsung Galaxy Android phone

[Kiriakos GR]

Press *#0*# on a Samsung galaxy android Phone, tap the 'sensor' button, then tap the 'light sensor' button and you can start measure your light setup, in LUX.

This is a known how to.
The new information is that Galaxy S5 (2014) this came with an much advanced sensor. 

This reads  R.G.B.W.
W = (Clear White)   
Alternative description  R.G.B.C.

Lowest measuring range appears as 0.00 LUX

My very own Galaxy S5 G900H this were hiding and a second surprise. 
The sensor also calculates CCT  that is color temperature.

With the sensor covered / complete darkness,  CCT becomes  1596.0 K (kelvin temperature).
With the sensor pointing at my computer monitor, at 10 centimeter distance, the measurements are:

Light sensor Display 82 LUX   
R: 110
G: 122
B: 129
W: 337

RAW LUX 55.00
CCT 5300.0  K (kelvin temperature range  1800 ~ 6500 )

Long story in short, I was unaware that my Galaxy S5 / Light sensor it can even measure color temperature.
I am using two Samsung compatible APP for easy review of my sensors.
Non of them gets in depth, at using entire pack of sensor measurements.

My fresh learning experiences
1) This White/Clear channel this is to calculate the absolute light brightness (Lux) of the environment.
2) kelvin temperature and individual color temperature, this can assist at perfectly tuning your own computer monitor.
3) ams TMD3702VC Color Light Sensor, sensitivity down to mLux levels
4) Enables accurate and stable measurement under dark glass in low light level environments

And I came that far by asking AI of how I can measure the luminosity of an deteriorated LED over my computer full tower case, this be 23 years old. 


https://ams-osram.com/products/sensor-solutions/ambient-light-color-spectral-proximity-sensors/ams-tmd3702vc-color-light-sensor