To understand how light influences our biology we must first introduce a type of light-sensitive cells in the eye called ipRGCs (intrinsically photosensitive retinal ganglion cells).
When light hits the retina in our eyes, the ipRGCs signal to the master clock (a brain region called the suprachiasmatic nucleus) that it is daytime, and the master clock responds by suppressing the production of the sleep hormone melatonin. In the evening, our bodies prepare us for bedtime by increasing the production of melatonin. 

The ipRGCs are especially sensitive to light of blue wavelengths (around 480 nm). Therefore, light sources that contain plenty of blue wavelengths are sometimes called circadian-effective light because they help us maintain a regular daily (circadian) rhythm. White light sources – such as daylight, fluorescent lights, and LEDs – may all appear similar but can have completely different spectral distributions.. Daylight is composed of all colors of the rainbow, whereas fluorescent lights are often lacking enough amounts of blue light. BioCentric Lighting™ is a dynamic LED lighting system adapted to simulate daylight to give us the right amount of light at the right time of day. BCL™ is enriched in the blue wavelengths to create a strong effect on our internal master clock early during the day. In the evenings, the blue content in BCL™ is reduced to provide enough light without disturbing the circadian rhythm.