It's not just a TSMC vs. Intel thing, Lunar Lake gets 7 more hours of battery life than Meteor Lake when doing the same "light office tasks" benchmark.
The numbers I've seen show that the peak power draw is similar to Meteor Lake, but it generally draws ~40% less than Meteor Lake when doing the same task. The SoC only idle power draw figures I've seen are 0.62W for Lunar Lake vs. 2.32W for Meteor Lake.