VLM-520-27 LPA Green Line Laser Module, Direct Green Laser Diode, Class I, Line Width 3.5mm @10m, 520nm, 90 Emitting Angle

When I received this laser module, my first impression is it appears very professional. It was packed in an anti-static bag with a laser safety sticker. The green laser line is very sharp at 5 yards, even can be seen outdoor. And, the laser line is perfect straightness. It was made from a direct green laser diode, not DPPS green laser, I was surprised it even worked below zero degrees without any problem. I used it as a guideline indoor open space without any air conditioner and it works fine all the time.

BUENA CALIDAD Y BUEN EMPAQUE

The headline says it all. If you use it indoors, it's fine. But I wanted it to be much brighter. If you purchase the recommended "farhop" aluminum mount, you'll have to bore out the mount to 1/2". Aluminum is soft, and it's easy to size up the mount to fit the laser. In the pics, you'll see I attached it to a secure piece of wood to make it easier to hold the mount steady.

I bought the "user's also buy" mount to go with this laser. It was a 12mm T-block with 12mm hole and a bolt to clamp the hole tight "farhop 12mm industrial aluminum...". The laser says 12.5mm diameter which is a tad under 1/2". I used a 1/2" twist drill to bore out the another .6mm (1/2" is 12.6mm) and the clamp works just fine.

Images don't clearly show that it is about a 1 inch laser with two dangling wires, no connection or button or plug. The schematic is not clear either. They could resolve this by posting an image of the part in the tiny bag it comes in.

I have purchased 5 of the VLM-520-27 LPA round brass body green line lasers. All where packaged well in an anti-static bag with labels. I tested these lasers in comparison with each other using same 8.4vdc Li battery source. Differences are relatively indistinguishable in brightness, focus/distance and line clarity/sharpness. Two of the five lasers seemed to shift towards shorter wavelength producing more greener color than the other three. All lasers drew approx 70mA from same source and had very minimal (if noticeable at all) beam artifacts. I feel these are actually much better in terms of function versus the more expensive and slightly finer VLM-520-37 LPA with a precision square body.

We had these running 24/7 for a few years before burning out. some of them are still going after more than 3 years!

Complete and utter garbage. Probably unsafe as well. This is one of maybe 3 reviews I’ve ever posted and couldn’t be more disappointed. Soldered proper connections using 20g solid wire. Heat shrunk etc. Powered with a variable dc power supply giving almost exactly 7v. As you can see in the pictures they giving varying degrees of brightness. Some lines are nearly 1” wide, at only the distance across my garage (about 18ft). Some are 1/8th inch. They also got so hot I couldn’t touch them. Waste of my time soldering and planning. Back to the drawing board. These were purchased for Halloween and sadly doesn’t look like I’ll be using them.