Mini USB UV Nail Lamp Teardown

Lamp Top
Lamp Top

Time for another eBay delight! This is a little UV lamp for curing false nail glues. These are definitely taking over from the older Fluoroescent tube based units, and seem to work well enough. In my case, they work well for exposing UV-sensitive PCB substrates for etching as well!

Cover Removed
m Cover Removed

Here the cover has been unclipped from the body, no screws externally. There’s a small PCB, which holds an unmarked microcontroller, the USB input, the power & timer button, and a MOSFET for switching the LED current. A pair of 2Ω resistors in parallel on the right limit current through the LED array, in this case to 1.25A for an output power of 1.56W.

Lamp Bottom
Lamp Bottom

Underneath the body are the apertures for the high-power UV LEDs. In this case there are 6 LEDs, each with a pair of dies of differing wavelengths. The legs fold up for storage.

LED PCB
LED PCB

Removing the 2 screws inside allows the boards to come loose, and this is the front of the aluminium-cored PCB supporting the LEDs. In this case they are all wired in parallel.

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