A wider colour space usually leads to more power consumption, because the backlight uses more power. We find that the Samsung C24FG70 is not the most economic model at maximum brightness white, but with black the results are not all that bad. Only the smaller Benq models are clearly more economic when it comes to power consumption.
Unfortunately we have less comparison material at a brightness of 150 cd/m², but here we also see a slightly higher power consumption than the Benq and Asus monitors. Not a lot in absolute terms, but relatively speaking about 25% more with white. Nevertheless nobody should be put off by a consumption that is 5 watt higher.
The C24FG70 is quite efficient in stand-by and when turned off.