Early radar changes Japanese night doctrine

How would Japanese night doctrine change if it had radar in the 1930s?

It would become more gun-heavy and less dependent on long-range stealth torpedo attacks.

Japanese torpedo doctrine profited from surprise, long range, and enough moonlight for visual targeting without revealing the firing ships. Radar-directed gunnery would reduce dependence on searchlights and let heavy ships engage effectively before illumination. That makes close-range gun actions more attractive and moves the doctrine toward the Royal Navy's post-1941 radar practice. The Imperial Japanese Navy's experienced cruiser and destroyer officers would carry those night-fighting habits into capital-ship command, helping the new system spread through the fleet. Torpedoes would remain dangerous, but they would no longer bear as much of the burden for detection and the opening blow.