In our experiment we use a fly to determine the flicker fusion frequency, i.e., that frequency where the fly starts perceiving a pulsating light as a constant light source. The human eye also has a flicker fusion frequency. For example, most people cannot see the flickering of a fluorescent tube, which equals the main frequency (60 Hz in Europe & USA).
Our experimental light source needs two input durations, namely how long the light is ON and how long it is OFF for. The input is provided in ms. From what I found out so far is that the unit Hz equals the frame rate, namely pictures per second. So a frame rate of 50 Hz is 50 pictures during 1 second.
But in my experiment it is about flashes of light, namely a light phase and a dark phase. Does the dark phase then count as a picture? So what I mean is whether 50 Hz represents 50 times lights ON + 50 lights OFF, or does it mean 25 times lights ON and 25 OFF?
Also, how long is then each light pulse?
My assumption is:
50 Hz are 25 lights on and 25 lights off within 1 second.
50 pictures in 1000 ms
1 picture per 20 ms
20 ms / 2 = 10 ms lights ON, 10 ms lights OFF