High intensity blue pen light...

**angryrectangle** · 10-13-2016, 04:12 PM

Hello hello!

We are looking to get a blue light pen to test/demonstrate the blue-light blocking coating on various lenses at our practice. I'm looking at some different options on Amazon, but just wondering if anyone here as any recommendations? What do you all use and where did you get them from?

Thanks!

**RichR** · 10-13-2016, 04:35 PM

Originally Posted by angryrectangle

Hello hello!

We are looking to get a blue light pen to test/demonstrate the blue-light blocking coating on various lenses at our practice. I'm looking at some different options on Amazon, but just wondering if anyone here as any recommendations? What do you all use and where did you get them from?

Thanks!

I'd contact your lab reps. We've received a blue LED flashlight and a blue laser pen. Both at no cost.

**Uilleann** · 10-13-2016, 04:36 PM

Qspex sent a cheapish laser pen with their "blu-bloq" lens sample several months back. It's a 405nm ±10 <5mW max class III if that tells you anything helpful in your search. As the frequency implies, it's down on the very far end of violet nearing the bottom of human visual perception. Basically, a 'black light' laser. No other markings to give away it's maker - likely China given the quality of construction.

**Lelarep** · 10-13-2016, 05:42 PM

I would definitely contact a lab, or a company that makes lenses with the blue block feature. Unless you get a laser or light source that is really tuned to the right frequency, and has a tight tolerance, it will make the product look like crap due to frequency spread outside of its range.

**angryrectangle** · 10-13-2016, 05:52 PM

Thanks for the advice!

We have asked our lab about it, unfortunately the lab manager that we deal with is a bit scatterbrained (a bit is a gross understatement). We were hoping to just purchase something in the meantime while we wait for him to eventually get one to us.

Unless you get a laser or light source that is really tuned to the right frequency, and has a tight tolerance, it will make the product look like crap due to frequency spread outside of its range.

Thanks for the tip! I hadn't thought of that...