Apparatus for controlling lighting parameters based on time of day and/or ambient light conditions and related methods
Disclosed is a lighting unit ( 10 ) that utilizes sensor data to select a fade-in or fade-out profile for one or more light sources ( 12 ). The lighting unit includes a clock module ( 20 ), an ambient light level sensor ( 18 ), and a controller ( 16 ). The controller receives ambient light level data from the ambient light level sensor and time of day data from the clock module, and utilizes the received information to automatically select a fade-in or fade-out profile. The controller can also use the received ambient light level data to calibrate the clock module.
1. A method for calibrating a clock module using a lighting unit comprising at least one LED-based light source, an ambient light level sensor, the clock module, and a controller operably connected between said light source and both of the said ambient light level sensor and the clock module, the method comprising the steps of:
receiving ambient light level data at said controller from said ambient light level sensor;
receiving time data at said controller from said clock module;
receiving a request to turn the at least one light source on;
receiving a request to turn the at least one light source off;
receiving ambient light level data at said controller from said ambient light level sensor;
determining, using data from said clock module, how much time has elapsed between the request to turn the at least one light source on and the request to turn the at least one light source off;
determine the approximate time of day based at least in part on how much time has elapsed and any change in ambient light level data from when the request to turn the at least one light source on was received and when the request to turn the at least one light source off was received; and
adjusting the clock module based on the determined approximate time of day.
2. The method of claim 1 , further comprising the step of initializing the clock module with initial time data.