Outdoors, 10,000 to 100,000 lux is quickly on your eyes. Indoors, the standard is 500 lux, and only 250 lux reaches the eyes. This creates 'biological darkness', even though we can see. With Sparckel, we are making towards 1,000 lux on your eyes. We know from science and the latest expert opinions that this quantity of light does stimulate our biological clock in the morning and afternoon. In the evening, there is little warm light outside, which makes Sparckel.