LED Bulb

Overview

The LED bulb is a screw-in retrofit lamp that drops into a standard Edison socket in place of a 60 W incandescent. At 9 watts it produces around 800 lumens of broadly omnidirectional light, drawing roughly a seventh of the energy of the lamp it replaces and lasting fifteen to twenty-five times as long. Inside the familiar A19 envelope sit a mains driver, an LED board, and a heat sink that together make the LEDs usable on raw AC.

Construction

Mains enters through the Edison Screw Base, an E26/E27 cap whose threaded screw shell forms the neutral contact and whose tip eyelet carries the live conductor, the two isolated by a vitrite base insulator. From there power reaches the Driver Board, a non-isolated constant-current stage that rectifies the AC through a bridge rectifier, smooths it across an electrolytic capacitor, and regulates LED current with a driver IC; a flameproof fusible resistor limits inrush and opens on fault.

The light itself comes from the LED Board (MCPCB), an aluminium MCPCB carrying eight phosphor-converted white LED packages reflow-soldered for low thermal resistance. Because LED life depends on junction temperature, the board mounts to the Heat Sink Body, a die-cast aluminium body forming the bulb neck, with a Thermal Interface Pad bridging the two. A polycarbonate Diffuser Dome dome scatters the output into an even, glare-free A19 distribution and closes the optical cavity.