$55 515nm 30mW Osram

[bloompyle]

So as some of you know, there are currently 4 main direct green diodes.

For 520nm, there is an 80, 120, and 1000mw version.

There is also a 515nm rated diode that I've been trying to get my hands on for a while.

RHD and I have loosely discussed a plan to do a group buy on these diodes, have them spectrometered, and auction off the first couple picks, then first-come first-served after that.

We want to keep this as fair as possible, and if there's something you would like to add to make this better, feel free to post this.

Though it wouldn't be fair to post this without being 100% about a bit of an ulterior motive .

The plan is to test these in bulk to find a freak <505nm diode for myself. Possibly sleasy, but I am trying to help others in the process. At the end of the day, you get a tested 515nm diode for cheap, and I can hopefully get a 505 or lower

 

[Down with Umbrella]

I've been eyeing the 515 wavelength for a while. The few threads I've read have some of them at about 518nm? I know AixiZ has a module rated for 26mW. Hmm I'll stay tuned to this thread.
Edit: 30mW or higher would be nice.

 

[DTR]

I got a few for someone in one of my previous batches that wanted the 30mW for the nominal 515nm rating but when I compared it side by side I was not able to note any color difference with the 50mW that is rated for nominal 520nm. Maybe my eyes are not that sensitive but I can see differences in blue pretty well.

 

[IsaacT]

I had a 515nm pen. Was spectro'd at 518nm. Can confirm the difference was negligible. That being said, 505 or lower would be MUCH bluer than the 515's or 520's.

 

[rhd]

I'm happy to help with something like this. However, it may be better for everyone else to find a US spectrometer to do the testing instead, to avoid bouncing diodes through the expensive Canadian postal system!

 

[bdgreenb]

i have a 511nm and the difference is VERY noticeable. i have a pic of it V 532

that's exactly the color difference to my eyes... at least on this monitor as well as my phone and iPad

 

[IsaacT]

But do you have a 520 to compare to the 515? That is the kicker.

 

[gismo]

I've already uploaded this pic I took back in January during one of my outdoor sessions, but figured it might give a bit of an idea about the green wavelength differences:

From left to right: 200mW+ 532nm - 100mW 520nm - 40mW 515nm.

 

[rhd]

I thought the potential idea was just to do a group buy, and then have a neutral person randomize (not auction) the order of who gets to pick the wavelength they want first, second, third, etc, after the organizer (you, if you were to do it) ?

 

[ped]

I've already uploaded this pic I took back in January during one of my outdoor sessions, but figured it might give a bit of an idea about the green wavelength differences:

From left to right: 200mW+ 532nm - 100mW 520nm - 40mW 515nm.

I have the Laserbtb 30mw 515nm , and it looks nothing like (to my eyes anyway) the picture above, only a slight difference from 532nm.

 

[Zeebit]

That looks like somewhere 480nm to me.

@Ped - double post

 

[Down with Umbrella]

That looks like somewhere 480nm

I agree, maybe Gismo got one of those freak <505nm diodes. To me it definitely looks blueish.

Gismo**

 

[jimdt7]

Definetely in for a GB! :beer:

Jim

 

[bloompyle]

They wouldn't be freak diodes if they were commonly 505 - 510

I can meter them with my monochrometer, but I won't be able to make pretty graphs with it like other can.

 

[Wolfman29]

I might be interested in this. I bought one of the laserbtb pens and it metered at around 520nm Made me very sad.

 

[gismo]

All I can tell is this: I can see there's a higher colour difference between 515nm and 520nm I own then between 520nm and 532nm when I look at them with a naked eye (just the beams, dots are observed with goggles, but even with goggles I can see some level of colour difference). Still my perception of the 515nm is as a very dark green, same the camera picked it up. I dunno, but I can't see blue tint in the beam I posted, is it because I had a laser eye surgery 2 years ago:thinking: and my colour depth recognition's changed thanks to it? No idea.

I've taken several comparison shots with all three wavelengths in my entrance hall. Not sure if I should post them here, don't want to highjack the thread. It's like 12 pics in total capturing the beams while gradually manually focused all the way to beam dots, medium distance and close-up (focused & unfocused). In all of them the colour difference is clear enough IMHO.

Another thing is, I'm on Macbook retina (if that makes any difference:thinking.