A quick look at what might be the cheapest LED tube light available right now. An all in one 20W LED tube light fixture from CDRKING, branded as Stark.
Inside the plastic fixture is an LED driver board and a cool white LED strip. The fixture is 30 x 1200 mm.
The LED Driver:
220V-240V AC input
118V DC output
MB105 – Bridge rectifier
ES1J – Fast Rectifier
BP2832A – Non-isolated Buck Offline LED Driver
Transformer temperature: 65.7C (measured by Flir One thermal camera)
ES1J temperature: 68.2C (measured by Flir One thermal camera)
The LED strip:
PCB board – no aluminum backing to act as a heat sink
Every 2 LEDs wired in Parallel. 38 pairs wired in series.
3.1V per LED.