A comprehensive resource for safe and responsible laser use
In a January 22 2018 Hackaday post, Tom Nardi purchased a “Home Accents Holiday Multi-Color Light Projector” from a hardware chain on clearance, marked down from $56 to just $14.
He removed the cover with four screws and found the parts inside used connectors instead of solder: “It’s like they wanted us to strip it for parts.”
The lasers were defocused inside. “…[A]t 3 meters the spots looked as large as dinner plates…. Once focused, it becomes pretty clear that these lasers are quite a bit more powerful than the <5 mW listed on the product’s warning sticker.”
The green and blue laser diode modules inside the holiday projector
Nardi noted that the blue laser, when focused, was “easily able to burn pieces of paper and punch holes in black plastic.” He also estimated that the green laser was “at least twice as bright” as a laser pointer he owns that claims to be 50 mW: “…it certainly would not surprise me if they are both [green and blue] at least 100 mW.”
Nardi writes: “If your biggest take-away from this post is that the Home Depot is selling a 440 nm laser you can use to burn stuff, I certainly don’t blame you.”
From Hackaday. LaserPointerSafety.com has a page with more information, including measurements of the beam output of a Star Shower projector, here.
Commentary from LaserPointerSafety.com: In fairness to Home Accents, the FDA-required warning sticker has to do with the laser power of the unopened unit in its factory configuration. Class 3R (IIIa) laser projectors like this are not allowed in the U.S. to be over 5 mW output power. It may be that after going through the holographic diffraction grating that creates the stars, that the Home Accents projector meets Food and Drug Administration requirements for user access to laser light.
This is not the first time such a project has been done. In 2007, Kip Kedersha (“Kipkay”) posted a YouTube video showing how he bought a surplus Playstation 3 laser diode for $45 and a Star Trek toy for $30, in order to make a laser-emitting phaser.
A Huffington Post story has the 2012 video, as well as links to earlier videos and detailed build instructions.
From Reddit via the Huffington Post
92 laser sights and 74 automatic machine guns were ordered between Sept. 2008 and January 2010 on Lake County letterhead and purchase orders. The officers paid for the products with personal funds. The amount earned from Internet resales was not stated, although the three officers were also indicted for understating their personal income by a total of $387,000.
The laser products came from Insight Technology Inc. and Laser Devices Inc. The 92 restricted laser sights were purchased for approximately $1000 to $1400 each and were sold on eBay for around $2800 to $4200 each. A special agent of the U.S. Food and Drug Administration (which regulates laser devices) made an undercover purchase as part of the evidence-gathering process in the case.Click to read more...
Casio America, Inc. (“Casio”) has recently learned that potentially dangerous handheld laser pointer devices are being marketed and sold by Wicked Lasers, Ltd. (and possibly others) that are believed to incorporate laser diodes improperly removed from Casio XJ-A series projectors. Casio has never authorized this unintended and potentially dangerous misuse of the light source component of its XJ-A series Projectors.
Casio specifically instructs and warns purchasers of its XJ-A series projectors that disassembly or modification of the built-in laser module is “very dangerous and should never be attempted,” and would like to take this opportunity to remind the laser enthusiast community of that fact. The unauthorized, unintended and potentially dangerous misuse of the laser diodes improperly removed from Casio XJ-A series projectors for use in these handheld lasers, such as Wicked Lasers’ SPYDER III, may create a substantial risk of fire and injury to users and others. Casio intends to pursue Wicked Lasers and any other companies that violate Casio’s rights by misusing components of its XJ-A projectors or other products to the fullest extent of the law.
At the same time, Casio strongly urges consumers to avoid these unauthorized and potentially dangerous “laser pointers” such as the SPYDER III.