a round white led lamp electrical board with smd leds arranged in a circle and a step-down power converter circuit

lamp led 4000k 12v 220v white 3200k 5600k bright bulb conservation diode eco economy efficient electric electrical electricity electronic element energy equipment glass glowing illuminate illuminated illumination invention isolated light lightbulb modern object power reflection save shine single smd stepdown technology transparent watt round board leds arranged circle step-down converter circuit background