Antminer L3+ owners can now get Blissz firmware:
https://bitcointalk.org/index.php?topic=2694602.0
I'm running it at lowest voltage with stock hashrate - my UPS reports 1.3KW draw = 650W each!
Add to that, no noisy fan spin-up at boot and board specific tweak options / quiet fan modes.
Praise Kek!