Philips LED PAR38 Lamp Teardown

Philips PAR38
Philips PAR38

These large LED Philips PAR38 lamps were recently on clearance sale in my local T.N. Robinsons electrical contractors for about £3, so I decided to grab one in the hopes I might be able to hack it into a low-voltage LED lamp. These are full-size PAR38 format, with most of the bulk being the large aluminium heatsink on the front. The back section with the power supply module is secured with silicone, so some unreasonable force was required to liberate the two pieces.

Specification
Specification

These lamps are rated at 18W in operation, and are surprisingly bright for this power level.

Lens
Lens

The front has the moulded multi-lens over the LEDs, to spread the light a bit further than the bare dies.

LED Array
LED Array

The LED array is two series strings of 4 LEDs, for ~24v forward voltage. Unusual for a high power LED array, this PCB isn’t aluminium cored, but 0.8mm FR4. Heat is transferred to the copper plane on the backside by the dozens of vias around the Luxeon Rebel LEDs. There is a thermal pad under the PCB for improved heat transfer to the machined surface of the heatsink.

Control PCB Top
Control PCB Top

The power supply & control PCB is pretty well made, it’s an isolated converter, so no nasty mains on the LED connections.

Control PCB Bottom
Control PCB Bottom

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