Custom 520nm MSV2

[Things]

At night beam should be brighter than 532. Only during the day will you see slightly less visibility, however most people view beams in darkness so it should be brighter.

Think you've got that the wrong way around, theoretical peak sensitivity is at 555nm

 

[IsaacT]

Think you've got that the wrong way around, theoretical peak sensitivity is at 555nm

I thought Photopic Peak was at 555nm, so during the day the 520nm will be ever so slightly less visible than the 532nm.

But Scotopic Vision, which is what we use at night(I think?), peaks closer to 500nm, so the 520nm will be brighter then than the 532nm....right?

I am very fallible, so it is entirely possible I am wrong....but after my last OOPS moment I read thoroughly on the subject :thinking:

Ever so tentatively hopeful.....
-Isaac

 

[styropyro]

I think he's talking about scotopic vision which peaks at 507nm.

edit:WBS beat me to it

 

[Things]

Ah, right. Makes sense once I re-read your post

 

[Atomicrox]

Yeah, I meant beam brightness..
I'm not really sure scotopic vision applies to laser beams. Wouldn't they look greyish under scotopic vision?

Does it look brighter or dimmer than 100mW of 532nm in real life conditions?

 

[RawPaul]

So where are you guys getting the 520 and 510nms. They look very nice from the pics. Also nice host. Very clean lines.:drool:

 

[scumbagatheist]

Placing my order w/ DTR this week...

 

[IsaacT]

Yeah, I meant beam brightness..
I'm not really sure scotopic vision applies to laser beams. Wouldn't they look greyish under scotopic vision?

Does it look brighter or dimmer than 100mW of 532nm in real life conditions?

Scotopic Vision mainly occurs at night. It is your "night vision". Most of us view beams in darkness so as you can see, it wouldn't be greyish. So if you are viewing the beams at night, 520nm 100mW would be brighter.

Photopic vision is what you have when the conditions are well lit. So if you are viewing the beams in the light, 532nm 100mW will be brighter.

So where are you guys getting the 520 and 510nms. They look very nice from the pics. Also nice host. Very clean lines.

DTR's Laser Shop
Illumination Supply

Both of these are reputable sellers. I would personally recommend DTR due to all of the good purchasing experiences I have had with him.

 

[Atomicrox]

Allow me to disagree. According to the wiki:

Scotopic vision is the vision of the eye under low light conditions. The term comes from Greek skotos meaning darkness and -opia meaning a condition of sight.[1] In the human eye cone cells are nonfunctional in low light – scotopic vision is produced exclusively through rod cells which are most sensitive to wavelengths of light around 498 nm (green-blue) and are insensitive to wavelengths longer than about 640 nm (red).

Scotopic vision occurs at luminance levels of 10−2 to 10−6 cd/m². Other species are not universally color blind in low-light conditions. The Elephant Hawk-moth (Deilephila elpenor) displays advanced color discrimination even in dim starlight.[2]

Mesopic vision occurs in intermediate lighting conditions (luminance level 10−2 to 1 cd/m²) and is effectively a combination of scotopic and photopic vision. This however gives inaccurate visual acuity and color discrimination.

Under scotopic vision we wouldn't see the beams' color at all. I think the light from the beam itself is enough to shift to photopic or mesopic.

To me 50mW-200mW 405nm beams get a very dim greysih color under total darkness, which might be the scotopic vision kicking in because they're too weak to activate photopic vision...

 

[styropyro]

Interesting, I never knew it worked like that. Like you said, 405nm is a great example of this. A 5mW 405nm laser is pretty dim but it still has a fairly visible grayish beam at night.

I'm curious to compare beams of 520nm and 532nm of the same power.

 

[Super Critical]

Interesting, I never knew it worked like that. Like you said, 405nm is a great example of this. A 5mW 405nm laser is pretty dim but it still has a fairly visible grayish beam at night.

I'm curious to compare beams of 520nm and 532nm of the same power.

Here. I have no LPM, but it's a Swimsurfer Super-overspec VS a 150ma PL520.

Easy to tell apart when they're next to each other

 

[ChaosLord]

That is a sweet build. Mine hits 95mW with an x-boost set to 300mA. I see a difference when compared to my Ti-B, but it's hard to see sometimes. I need to compare it to one of my fasttech modules, since there closer in power.

Love that host!

 

[bloompyle]

I have an LPM coming in soon, just shipped from the EU, so it might be a bit. Once it gets here, I'll post measurement pics.

Also upgraded to a 405G lens.

 

[ChaosLord]

Did you get a bluefan basic LPM? Just wondered because you said from the eu, and i was in agony waiting to get mine. They held it in customs in illinois for three days..grrr. I also have a G2 on mine, and was impressed with how good the beam looked.

 

[bloompyle]

Yeah, that's the one. The difference between the G2 and glass is remarkable. It's a much tighter beam, not sure how, but it is.

And if anyone is looking for a good diode source, Will from Laser 66 is an excellent source. I got mine from him, and he was a breeze to work with. free to answer any questions you may have!

 

[ChaosLord]

Yeah, that's the one. The difference between the G2 and glass is remarkable. It's a much tighter beam, not sure how, but it is.

And if anyone is looking for a good diode source, Will from Laser 66 is an excellent source. I got mine from him, and he was a breeze to work with. free to answer any questions you may have!

Hmm, I'll have to try the my 3 element on it.

Will definately check out laser 66. I've got a couple of kryptons coming soon, so will need some diodes.