This mask shines red and blue visible light onto the face, the red to reduced inflammation and the blue to kill acne bacteria. It is powered by four AA cells in an “activator” which provides thirty, ten minute, sessions. Despite promotional advertising which would suggest otherwise, the limit of thirty sessions is simply a ploy to require you to make ongoing purchases to continue to use the device. The batteries are replaceable, there is no evident reason for the “activator” to wear out, or degrade in performance after any number of uses, let alone thirty.

The mask contains twelve blue LEDs, and nine red LEDs. They have a faded power on and off sequence, but I think run at full power for the ten minute session duration, though I haven't checked this.

The “activator” contains four AA cells, a two digit LCD and a double sided circuit board (L-D E327501 “Universal Controller Gen-2.7” Rev A3). The circuit board contains is one encapsulated controller chip, a serial memory chip (Atmel AT93C46D, 64 words by 16 bits, serial EEPROM), a quartz crystal (32.768MHz), a power switching transistor (SS8050, NPN, 1.5A), and a voltage regulator.

There are videos ¹⁾²⁾ showing an extremely crude hack to the activator, which wires the device “on” continually while plugged in (basically shorting out all the control circuitry). No power control, no timer (ie no safe-guards). The product has been withdrawn due to possible eye hazards to some people (it has a built in amber filter in front of the eyes, that provides little protection as the light can reach the eyes passing directly underneath it), obviously using the device for an unlimited time (rather than 10 minutes), would greatly increase any hazard.

There is also a great series of articles about reprogramming it Hacking the Neutrogena visible light therapy system to get 99 lives using an Arduino, which retains the timer function and power regulation (This hack modified for Raspberry Pi here: neuprog). And another go at Neutrogena Mask Activator Hack using a Raspberry Pi. Not very easy for the average customer though.

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