Visualising Light Data

One of the goals of Lightlog is to help people engage with and reflect on light data they collect over time. Due to its size and power constraints, the physical Lightlog device has a minimal user interface (UI), just enough to display the daily light goal reached, and show if the current illumination is bright enough to be effective towards the daily goal (2,500 lux or above). Lightlog collects much more data than it can display alone, by synchronising to a device with a screen and more computing power, allows a rich, engaging, detailed views of your daily light profile, and the opportunity for additional analysis over the set of collected data.

The primary visualisation is designed around the full colour spectrum composing visible light. It’s an approximation of a full light spectrum as Lightlog records single sample points in the red (~614nm), green (~525nm), and blue (~468nm) frequencies; with a fourth sample unfiltered, capturing as much of the full spectrum energy as possible for lux calculation (an interesting future project could be to use many more sensors across the spectrum frequency to generate a high resolution spectrum with chemical absorption lines). For use with Winter Blues and Seasonal Affective Disorder, the three red, green, blue sensors provide useful information about the frequency of light exposure as some studies have shown shorter wavelength, blue light, is more effective, vs. longer wavelength red light.

Below shows an example image taken from real data displaying several days from November. Notice the relatively long nights and short Scottish days at this time of year.

Example Lightlog data for Nov 28-30

Below is a close-up view of November 30th; note the strong direct sunlight between 12:30 and 13:30, this would have been more than enough for the recommended daily amount of bright light.

Example Lightlog data for Nov 30