Photodiodes are widely used in electronics in a variety of areas from ambient light detectors to wide bandwidth optical telecommunications systems. Photodiode technology was developed in 1950s and since that time no significant changes were introduced. Traditionally, photodiodes operate at DC reverse bias and the incident light intensity can be extracted from the measurements of photocurrent. Such operational mode can be considered as static. For the first time, ActLight introduces the Dynamic PhotoDiode (DPD) concept. Applied to DPD voltage is switched from reverse to forward while the triggering time of photocurrent is measured. The strong dependence of the triggering time on the incident light intensity brings light sensing to the completely new level.