by Steve » Tue Feb 06, 2018 7:59 pm
+1 on both the tracer units and flashlights with tape switches. I have run the same 4 or so G&G rechargeable tracer units for the better part of a decade. HUTUs are awesome as well.
As to lights, everyone has their own opinion on what the best brightness is. For me, 65 lumens is comfortably bright enough to navigate at a run through fairly cluttered terrain. Anything over 200 lumens or so is bright enough to temporarily disorient an unsuspecting opponent in a dark environment. 800-1000 lumens is enough to disorient an unprepared opponent regardless of ambient lighting conditions, and significantly inconvenience even an opponent who is prepared. The flip side is that your light will reflect off of things and bounce back to inconvenience you.
Rhodopsin (visual purple) is the light-sensitive receptor protein that the human eye produces. It's the human biological version of a Night Observation Device, amplifying small amounts of light so you can see. It is remarkably sensitive to light, and takes about 30 minutes or so to come back fully after getting exposed to a light source. So, when you hit the button on your 1000-lumen strobing weapon light, anybody downrange is going to lose their night acclimatization. Also, everyone around you is going to lose their night acclimatization. Also, everyone within forever is going to know that there is a stupidly bright light source in the direction of all the swearing.
Common courtesy is to not silhouette friendlies with a light source. If where you are staring is 12 o'clock, and there is a friendly located anywhere between 10 and 2, don't turn your light on. It backlights them, and it's a tool move.
That being said, I really like carrying three or so spare 200-lumen LED lights. I can turn them on, point them at where I expect the bad guys are likely to show up, and then move back and left or right of the light. Best case, the bad guys find somewhere else to be because bright light is irritating and stuff. Worst case, the bad guys spend time shooting at the area around the light trying to hit whoever is holding it, and I get to shoot at them. Also, it's remarkably satisfying to watch a group of grownups execute an assault... on a flashlight sitting on a table, pointed at a window across the room.
As to the laser thing, I prefer green lasers myself. I have no idea where the total stupidity regarding green lasers as intrinsically unsafe came from. The FDA determined that 5mW is the eye-safe limit for lasers. Not red lasers, or green lasers, or blue lasers, or IR lasers. Just, lasers. Because their research suggests that 5mW is 10% of the output threshold where damage is likely to happen (50mW). That damage, by the way, is temporary loss of visual acuity just like the spots you see after looking at a camera flash. The permanent damage range is a good bit higher than that. The human eye is much more sensitive to colors in the 550nm portion of the spectrum (green-yellow) than the 650nm band (red). The number I recall being kicked around is that for the same power output, the human eye picks up a green laser about 4x as well as a red laser. So, a red laser that "appeared" as bright as a standard <5mW green laser would need to be ~20mW.
My true guess is that it comes down to cost and ignorance. Back in the day, green lasers were stupidly expensive because there was no common excitation medium that would produce a green LED. To get there, a 808nm IR laser diode would have the output dumped through a frequency-doubling filter. And as you put more effort into something, the costs go up. Since the cost difference between a legitimate green laser with a tape switch from a reputable company and the first couple years of production of the chinese knockoff houses was pretty small, the only green lasers that tended to show up on the fields were real-steel units. And if it's made by Surefire, it's gotta be dangerous, right?
The initial runs of blue lasers were the same way, both in the frequency filter requirements and the cost. Amazingly, single-stage blue laser diodes have been around since 2010 or so. They don't show up on the tactical market very often because they are just as visually muddy as red lasers. So when you do find them, they are around 3x the cost of a comparable red laser. Around the same time, single-stage green diodes hit the market. The better manufacturers (Streamlight, Surefire, Insight Technologies, etc.) have mainly switched to these. The cheap imported junk lasers still run an IR beam through a plastic filter. The single-stage diodes are still new(ish) enough and their exitation media is more expensive than the GaAlAs used in IR diodes that they are more expensive. The single-stage units are a ton more power-efficient than the frequency-doubled units (but less efficient than red laser diodes).
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