iMac Power Consumption

Spent about an hour or so searching the inter-tubes for this and I can't seem to find a specific answer. Looking to see what the power consumption of an iMac when just the screen is sleeping. Not the entire computer, just the screen. I've seen plenty of when any computer is in sleep mode.

I thought I stumbled on the answer with iStats, but it only shows that stat for a laptop. For the iMac (Late 2015 iMac 27") it does have a wattage stat, but it didn't have any kind of history like I could find with my 2017 13" MBP. It's also a different sensor(s) as it splits it into CPU and GPU and then give a Total. It looks like from Total that it's probably giving a good number as far as the computer, but not the display's power.

The reason I ask is that I've always set my computers to NOT sleep and just sleep the displays. I have a Hot Corner to immediately put the display asleep. Of course when I close the MBP it sleeps and that's fine. I just don't do that with the iMac. Mainly because of convenience and supposed issues when external drives are connected via hubs or directly to the iMac and have issues when a computer goes to sleep.

Other settings I have is I don't allow hard drives to sleep. And I don't use Power Nap. Not sure if Power Nap is a happy medium to Sleep Mode to draw less power, but not have any hard drive issues.