One way is to buy a cheap lux meter on Amazon, and post the values here for your workspace (with screen off and on), and the room you are in before bed (screen off and on).
These numbers ignore spectrum, but they make a neat discussion.
Here, we've lit our office at >500 lux of 5000K LED, and our house can do <5 lux of 1500K before bed. This nighttime setting is maybe extreme for some people, but I think it's actually a reasonable start to the "control" we need to affect circadian timing.