I’m currently working on a custom PCB for this holder – involving protection, fuse holding, reverse polarity protection and warning LED, and maybe even an opamp circuit for roughly measuring ...

Rather than soldering all those LEDs, he could have used SMD LEDs assembled by the PCB manufacturer, and have 3 holes around each LED to insert a bulb-shape 3D printed housing (clear PETG).

Taiwan's PCB makers are poised to embrace a new wave of shipment boom for mini LED backlit boards along with increasing penetration of mini LED backlighting technology in new notebook and TV ...