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The light sensor is an environment sensor that measures ambient light levels.
This sensor does not require any permissions. The JSON format for a sample from this sensor is:
{
"userid":"test-user-id",
"deviceid":"test-device-id",
"senseStartTime":"16:51:52:118 30 06 2015 +0100 GMT+01:00",
"senseStartTimeMillis":1435679512118,
"dataType":"Light",
"light":46,
"maxRange":60000
}