Need help reasoning about video oscillation >60hz I want to make a basic video oscillator for the web. What I want to do is basically illustrated in a tutorial for Lumen: essentially, I want to define an oscillator to turn on and off a color signal at a given frequency. This is simple to do for a frequency below 60hz, but anything higher does not seem to get the effect that the program is showing.

It seems likely to me that the tutorial is far more simplified than what is going on behind the scenes, and since I don't have background in graphics programming I don't really have the tools to even know what I need to know. I'd like to understand what is going on and if it is possible to produce such things for the web
Yeah, that makes sense. Most flat panel monitors on the market have a 60Hz refresh rate! So you are not going to be able to flicker faster than 60Hz due to technical limitation.

Were you to do this with a electron sweeping oscilloscope, or a LED lamp connected to a PWM source fast enough then no problem (you can find this in arduino samples). It would work. 

You can also emulate the effect by rendering multiple frames and then blending them. But you should take careto do correct kind of blending as the monitor output is not nesseserily linear!