The red, amber, green, signal tower on the shelf in G1.

Box contains an ESP8266 (D1 mini), a relay board, and a 5V switching supply for the ESP.

Light tower takes bayonette bulbs with two contacts on the end and pins at the same height. Currently fitted with 12V LED bulbs.

Draws 650mA at 12V with all bulbs on. The supply connected at the moment is rated for 500mA.

If flickering, it is likely the bulbs are failing.