setLightAccordingToPolicy ()
Now--working-- 
To check it measured state: need help.. I need to know the best time
duration to check its state after I set the new state to the light.
getLampMinPower()
Now--working-- with sun,cloud and window size, minLux for each room are
hard coded. Some data e.g. minLux have to retrieve from DB but I need
help how to do to speed up. Anyway, we can change this later.