Unfortuantely the Time-of-Flight sensors work by shooting out some light and detecting what comes back. So they consume power with each range. The only ways to save power are to range less often and to range for less time.
Ranging less often works if the person is willing to stand there for a while - think toilet flush applications.
Ranging for less time works, but you get a less accurate distance.
The only real way to save power would be to use a passive I/R sensor, then use the ToF sensor to double check the PIR sensor as they are not very accurate.
If this or any post solves your issue, please mark them as 'Accept as Solution' It really helps. And if you notice anything wrong do not hesitate to 'Report Inappropriate Content'. Someone will review it.
