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Hi and thank you for great links!
There is only one puck.js smart meter example https://www.espruino.com/Smart+Meter that I found.

Apart from the LDR, there are no other components. The idea is that it will wake up to send out a reading every hour (as a baseline)

Hi everyone
I am trying to follow the puck.js power meter example. Have a question about LDRs and battery life.
I have the below LDRs available at the local store. Which one would be the best for battery life?
Also, how to estimate, how long will the battery last for? Is the main power usage during the transmission?

Light resistance: 450K-1.2M
Dark resistance: 10MΩ

Light resistance: 135K-420K
Dark resistance: 10MΩ

Light resistance: 45kΩ - 140kΩ
Dark resistance: 10MΩ

Light resistance: 5kΩ-10kΩ
Dark resistance: 0.5MΩ