Got a few legacy GL-AR150s with the most recent firmware 3.216 2023-03-21 from GL.iNet download center.
Obviously Doing funny things with the onboard leds of the GL-AR150 :-) and AR-150 LEDs - config and use no longer apply as LED device names:
Now there is gl-ar150:red:wlan with ath9k-phy0 its apparent duplicate,
and gl-ar150:green:configurable, working as expected.
However, once LuCI's installed, gl-ar150:green:power goes and stays dark, no matter the setting in 192.168.8.1/cgi-bin/luci/admin/system/leds (or echo 1 into its brightness):
How is this third LED to be customized?