The goal here was to capture images intermittently and reduce power consumption.   The following stats are all for a headless, HDMI disabled, RPi Zero W connected via SSH on Wifi. This is using a Purethermal 2 board and a Lepton 3.5 Here are the results:

• 0.098 A -  Idle and purethermal2 is unplugged 
• 0.175 A   -  Idle, now the purethermal2 is plugged in 
• 0.340 A  - There is always a brief spike when the shutter operates 
• 0.250- 0.300 A- When running script that streams constantly from camera
• 0.185A  for 9 seconds, 0.240A for  less than 1 second @ when running script that takes output every 10 seconds

Using exactly the same setup and a Lepton 2.5, the results are almost exactly the same, except it seems like the peak current is a little less ( ~0.23A) and duration of the higher current for running is also less.