In order to properly mimic the sun, accurate measurements of the sun’s emission spectrum must be taken over many days for a high number of samples. The current progress of the project is a light sensor datalogger with the following features that measures sunlight throughout the day. 

• 8 Channel Spectrometer: The human eye is sensitive to harsh light sources with non-uniform emission spectra like fluorescent lights, so it is important to get a baseline on the sun’s emission spectra to mimic.
• RGB Sensor: This sensor is included to measure light as our eyes see them and get readings on the color temperature of daylight, an important indicator for our circadian rhythm and measure for cortisol and melatonin release in the brain.
• Data Recording: Every 5 minutes throughout the day, the device takes readings from the sensors and records them in a .CVS file on a micro SD card.
• Multi-Color LED: For testing purposes, the microcontroller includes and on-board RGB LED that can display the color of light measured.

In order to get accurate measurements for the light sensors and color temperature, the recorded values have to be calibrated and scaled to match known values. Many white and colored LEDs were used to calibrate the sensors with known emission spectrums from their datasheets. A configurable RGB LED bar was built as well to record theoretical RGB values that could be compared to the values measured by the sensor for calibration.