Can a pi zero be used?
It can, but barely!
https://www.reddit.com/r/lightningnetwork/comments/rjepli/raspberry_pi_zero_2_w_15_is_this_good_enough_to/
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RPI4 costs a kidney here, u have to buy a kit with a lot of useless crap
You can also use cheap laptops as long as they meet the minimum requirements of a lightning node.
Don't they use more power?