Android & IoS light

Access the Light sensor on the Android and IoS and be able to record number of times i switched on my own room light as; on = true and off = false and text log saved for this with the total number of times + date / time and serial order with 1,2,3,4,5,6,7.... in a string. The app should have basics for testing the same, a text log to save the record of this with time and in a serial order. This is required in csharp.