My Arctic can light plain white paper on fire fairly quickly.
It's quite possible for 100mW of 405nm to burn through white paper. White paper absorbs 405nm light much differently than it absorbs light at higher wavelengths. My 100mW 405nm also burns holes in white paper, it's far from being able...
I just focus the Arctic's beam and aim it slightly below the tip of the wick. Takes anywhere between 3 and 20 seconds to light. It's worked on every candle I've tried it on (4 so far).
I'd suggest slowly adjusting the distance until the reflected color is orange instead of blue.
I believe they're just going by the current the driver is delivering.
Perhaps since it's not as inefficient as a DPSS, they feel it's an accurate estimate.
I never received any tracking information.
Oddly enough, that seems to be exactly what's just happened to some.
From this thread in Wicked's forum: ARCTIC LASER SEIZED BY U.S. CUSTOMS! GOT PACKAGE, NO LASER
You can pretty much estimate it based on the color of the re-emitted light. The light I was thinking of was yellow or orange light (around 580nm-620nm); which seems to be rather common for fluorescence.
I don't think people are aware of the fluorescence hazard. Even if they have OD6 445nm goggles, if a powerful 445nm hits something and fluoresces to ~590nm the goggle's protection will be nearly non-existent.