Yeah but thats highly subjective, I know my main (of 3) display uses between 26 and 50w which is going to be framerate and lighting etc dependent.
But others will be lower or higher, there is a lot of inequality in this area.
I think 50 is more typical for a decentish higher monitor, or a much older one.
I have one of the first 34" UW monitors (Acer BX340CK, 75Hz, IPS) and that claims 53.6w typical usage. Which I imagine is pretty average for a PC monitor.