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ArcticMyst Security by Avery

Not feeling the love on 405nm visibility

GAtkins

GAtkins

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Got two 405nm diodes, one each from DTR and Survival. Installed both in C6 hosts. Both should be around 500mW to 700mW with one driven at 447ma (Survival) and the other driven at 428ma (Mohgasm), each with a G2 lens.

These are great lasers and they burn like hell, not like the 1.95W 445nm's of course, but burn well nonetheless.

I just don't like the beams and maybe that's caused by my old eyes, but they each seem as bright to less bright than a known 5mW 532. One I have metered, see my sig. The other I have not but will when I have a chance.

Just not feeling the love on the beam visibility. Great lasers though.

The 532nm's and the 445nm's will light up the night. Not so the 405nm.

Oh well.

Glenn
 





Sigurthr

Sigurthr

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Everyone's eyes are different, though being as or less bright than 5mW 532nm seems extreme to me. I've only fired up my 450mA 405nm G2 module once since I don't have the host yet and thus no where enough heatsinking, but it lit up my room about 1/4 as brightly as my 1300mW 445nm which seems about right for 700mW.
 
Lase

Lase

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Sigurthr said:
Everyone's eyes are different, though being as or less bright than 5mW 532nm seems extreme to me.
Click to expand...

I, personally, can barely see the dot of a 500mW 405. But I have an eye problem which doesn't let me see <500nm properly. I'm yet to see a 445 but I know I'll be disappointed with it when I do.

Lase
 
Sigurthr

Sigurthr

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Lase said:
I, personally, can barely see the dot of a 500mW 405. But I have an eye problem which doesn't let me see <500nm properly. I'm yet to see a 445 but I know I'll be disappointed with it when I do.

Lase
Click to expand...

Is it Tritanopia/Tritanomaly? Your Blue-Cones are mutated shifting the peak sensitivity upwards to the green part of the spectrum in that condition. Sorry to hear about that!

I did some research and found that apparently 25% of people cannot see 780nm at all. I bought/made a 5mW 780nm pointer just to test that. I can see it from across the room when against a white wall, and can see the beam in fog. My wife can see it too but much dimmer than I.
 
Lase

Lase

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Sigurthr said:
Is it Tritanopia/Tritanomaly? Your Blue-Cones are mutated shifting the peak sensitivity upwards to the green part of the spectrum in that condition. Sorry to hear about that!

I did some research and found that apparently 25% of people cannot see 780nm at all. I bought/made a 5mW 780nm pointer just to test that. I can see it from across the room when against a white wall, and can see the beam in fog. My wife can see it too but much dimmer than I.
Click to expand...

Yeah the doc said something along those lines :p I didn't pay much attention because he said that there was nothing that could be done about it.

I haven't tried with NIR yet, but I'm thinking I may see it better because of my condition? It would be cool to be able to see into the IR spectrum (808) and have no one else be able to see it. Think of the fun I could have. :eg:

Lase
 
Sigurthr

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Haha, that would be interesting. IIRC unless the mutation affects the red cone you'll likely not see NIR any better. Though, I haven't found a single lick of info as to why I'm able to see 370-400 and 700-850 so well. By all info I've found 850 should be totally invisible, but I can see 1mW 848nm. Unfortunately mutations that cause slightly better vision aren't really recorded.
 
Lase

Lase

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I've played with a 685 (10mW) and compared it to my 635 (5mW) and they're relatively the same brightness even though my friend said he couldn't see the 685 very well (it was his anyway).

I need to order some 780 and 808 lasers ASAP and test my theory.

Lase
 
Sigurthr

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Aixiz seems to have the best prices/selection for low power (safe) NIR modules.
 
mfo

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Sigurthr said:
Haha, that would be interesting. IIRC unless the mutation affects the red cone you'll likely not see NIR any better. Though, I haven't found a single lick of info as to why I'm able to see 370-400 and 700-850 so well. By all info I've found 850 should be totally invisible, but I can see 1mW 848nm. Unfortunately mutations that cause slightly better vision aren't really recorded.
Click to expand...

Strange. I can see 980nm, but only in a dark room. Does that make me a weirdo?
 
HaloBlu

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Different individuals visual limits at either UV / IR end is quite interesting. :pop:

Sigurthr: Is 1mW 848nm barely visible at least? Would that be the dot at 1mW? What color is it?
Have you tried a 337.1 TEA nitrogen laser? :D

mfo: At what power is that 980 visible to you & what color?
I read some see it as grayish or greenish instead or deep red.
 
S

Stix62

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I watched a program on t.v a while back about a man who had a lens replaced in one of his eyes (maybe both-cant remember). He was fine until he went shopping one day and approached the check-out. Every time an item was scanned he was getting a bright flash of UV. I bet a 405nm would look awesome to him.(or maybe not - far too bright) :yh:

I was just googling to see if I could find a link for that, and apparently something similar was in the news only yesterday. A man can now see UV after a cataract operation.
 
scopeguy20

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For a bright beam of 405 you need fog... it is natural for 405nm to be about 1% the brightness of the same mW of 532nm light! -GH
 
mfo

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HaloBlu said:
Different individuals visual limits at either UV / IR end is quite interesting. :pop:

Sigurthr: Is 1mW 848nm barely visible at least? Would that be the dot at 1mW? What color is it?
Have you tried a 337.1 TEA nitrogen laser? :D

mfo: At what power is that 980 visible to you & what color?
I read some see it as grayish or greenish instead or deep red.
Click to expand...

I can see 5mW in a pitch black room, and I can see 500mW in a dark room. It appears as a very faint gray/blue to me.
 
InfinitusEquitas

InfinitusEquitas

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Always interesting to read about other people's perceptions.

Personally I think something is off with my vision of ~640nm because while a few people compare then in brightness to 445nm, to me they are just barely more bright than 660nm, and nowhere near as bright at even double the power.

As for 405nm, under 600mW is barely enough for a decent beam to me. Under 500mW is useless. 405nm does look great with a bit of fog though.
 
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