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SmartRF06 EB SFH 5711 ambient light sensor (ALS) - HOW TO CONVERT RAW light sensor values TO LUX or LUMENS?

Other Parts Discussed in Thread: CC2538

Dear TI Engineers,

 I am using CC2538 (EM) + SmartRF06 Evaluation Board (EB)  (Linux Ubuntu).

I am able to obtain the raw output values from the analog SFH 5711 ambient light sensor (ALS) by using the adc_sensor.value(ADC_SENSOR_ALS); function in my code.

The raw output values are usually 14,000 - 15000 under room light conditions and around 6000 when the sensor is covered. These can neither be lux or ADC values.

However, I wish to obain the output of this light sensor in terms of lux or lumen values. Any pointers, formulae to convert these raw values in lux or lumen units would be of tremendous help.

The function given at the bottom in this link https://github.com/cookieglitch/NiceAsgardZNP/blob/master/HAL/hal_Osram_SFH5711_ambient_light_sensor.c is also not helping my case. I am not using ZStack or 6LowPan. 

Thanking in advance for kind consideration,

Indrajit