Ultra-efficient Emos LED 3.8W 806lm 212 lm/W - new EU efficiency class A
(Reverse Engineered Schematics)
The schematic of an ultra-efficient LED Emos 3.8W 806lm with an efficiency of 212 lm/W, which therefore falls into the new EU efficiency class A (above 210 lm/W). The chip is marked B1995SB 4UP081B. The LED current is 16.48mA and the total voltage drop is 225V, there are a total of 84 LEDs in series and 2 in parallel. So one LED has a voltage drop of 2.678V.
Unfolded box of the Emos LED in new EU class A, 3.8W 806lm, replacing a 60W bulb, 4000K version, 50 000h lifespan, E14 socket, 230V 50Hz.
Emos ultra efficient LED after dissection - the glass bulb with 4 LED filaments
LED EMOS class A after dissection - the power supply board. A switched step-down (buck) converter, which was in the socket.
Emos LED class A after dissection - power supply board (switched step-down converter), integrated circuit side. The chip marked B1995SB 4UP081B contains a bridge rectifier and a switched step-down converter for LEDs with a constant current.
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