points by dlcarrier 3 days ago | 0 comments
The streetlights in my neighborhood still have the round photo sensors on top, that have something like a watt of standby current for the sensor itself. I don't think they're trying hard to save powwer.
[–] quickthrowman 3 days ago
A low-voltage photocell uses like 5mA @ 24VAC these days, it’s nowhere near a watt. You can buy a wireless battery powered photocell or occupancy sensor that will last a decade.
This Acuity occ sensor/photocell combo draws 4mA @ 24VDC: https://pdmassets.azureedge.net/library/SS/documents/specshe...
[–] dghughes 3 days ago
That's why crows sit on them on cold days.
Anything more modern than that, even if it has a similar case, will use less power