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Old 01-14-2011, 11:49 PM #17
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Default Re: For those with multiple 445's........ ??

Quote:
Originally Posted by anselm View Post
I've been driving my 445 with anything from 120ma up to 1900ma.
Below 240ma it is more like a faint LED, it doesn't even lase.
At lasing threshold, you can find a single mode operation in which only the biggest
of the bar right in the center lights up.
As you increase current, more and more bars light up, and they emit more strongly as well.
Around 300ma, the beam is pretty dim, even in the dark.
Around 600ma, it becomes rather noticeable, but nothing compared to the beam
when being driven at around 1200ma.
Above that current, I can hardly notice much of an increase in brightness anymore, but
of course it burns more violently.

You must be doing it wrong then.
well, can 1W start a fire? I said.. fogo! :P
not the common black burn that you get thru, I said a "pop" and FIRE!
is it possible with 1200mA in?


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Old 01-15-2011, 12:14 AM #18
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Default Re: For those with multiple 445's........ ??

Quote:
Originally Posted by Coherent Light View Post
^^ What a beautiful rainbow ^^
Ive got more laser since then.
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Old 01-15-2011, 05:31 AM #19
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Default Re: For those with multiple 445's........ ??

My first 445nm diode is really inefficient for some reason and only produces about 300mW @ 800mA. I built another, also at 800mA, and this one puts out about 900mW. I can tell you that there IS a difference. The beam is about twice as noticeable. The dot is twice as bright.

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Old 01-15-2011, 05:55 AM #20
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Default Re: For those with multiple 445's........ ??

Oh a zombie diode.

Is 800 the highest current you have tried ?
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Old 01-15-2011, 11:02 AM #21
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Default Re: For those with multiple 445's........ ??

Quote:
Originally Posted by hxdrummerxc View Post
I am a beam guy. I do casually burn stuff... but mostly I just love the beams. The brighter the better.
I can tell you the more focused a beam is and the smaller the divergence is, the brighter it seems for your eye.

this is an effect of the human eye, which is sensible for light per area.

for 445nm that makes nearly no difference because in most times the optics are comparable and the beam diameter is nearly the same. All i want to say is that a 800mW beam with good optics seems brighter than a 1000mW beam with bad divergence that is used for burning...

so be sure to buy/builsd a laser with good optics if you want to enjoy the beam.
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Old 01-15-2011, 02:43 PM #22
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Default Re: For those with multiple 445's........ ??

All I know is my 1.9W 445 is much brighter than my 1.1W I had.
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Old 01-15-2011, 03:36 PM #23
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Default Re: For those with multiple 445's........ ??

^A theoretical 31% isn't something I would consider much brighter... but you know what they say about the placebo.
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Old 01-15-2011, 05:45 PM #24
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Default Re: For those with multiple 445's........ ??

I guess I jumped the gun on the much, I wasn't meaning this to be interpreted As twice as Much. Just much, maybe I should've said a little.


Sorry if that was misinterpreted, it burns much netter though, that's for sure
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Old 01-15-2011, 06:55 PM #25
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Default Re: For those with multiple 445's........ ??

Quote:
Originally Posted by benmwv View Post
Oh a zombie diode.

Is 800 the highest current you have tried ?
Yup. Any higher would be too much for a handheld IMO.

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Old 01-17-2011, 04:24 PM #26
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Default Re: For those with multiple 445's........ ??

Quote:
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Yup. Any higher would be too much for a handheld IMO.

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Old 01-17-2011, 06:58 PM #27
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Default Re: For those with multiple 445's........ ??

Quote:
Originally Posted by LazyBeam View Post
Blasphemy. Shun the nonbeliever.

SHUUUNNNNNnnnnnnnn
Not for the diode, for the driver. The flexdrive has an efficiency of around 93-95% at best. That may seem really good but if the diode is getting like 4 watts of power then the driver is dissipating upwards of 300mW of heat. That's alot for a unheatsinked component smaller than your fingernail.

Longevity > Performance IMO.

Besides, how bright do you need it. LOL, there isn't much of a difference, visually, between 1000mW and 1500mW.

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Old 01-18-2011, 07:33 AM #28
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Default Re: For those with multiple 445's........ ??

I just shot this video.

It is comparing my 2050mW and my 1167mW 445nm laser.
The black larger laser is the 2050mW Lase and the Stainless steel one is my 1167mW without any smoke in the Air. It still Does not do it justice the difference viewing it through a screen. But it is Much Brighter.
Watch in HD.


Hope this Helps.
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Old 01-19-2011, 04:31 PM #29
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Default Re: For those with multiple 445's........ ??

Sacrilegious I know, but I dont eve know the exact MW of my build. That one makes people around here fume lol.

Anyhow, compared to my Arctic. You can only tell the difference in the right environment. In dark night with your eyes adjusted against a black sky, the home built is noticably brighter. The beam is much whiter and more vivid while the arctic is more of a washed out blue. Its not so much the brightness you notice, they just look like different colors. The Arctic is royal blue where as sheer brightness of the DIY makes it appear a closer to turquoise.
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Old 01-19-2011, 05:00 PM #30
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Default Re: For those with multiple 445's........ ??

^^^Here is a good example of what you are talking about. I shot this video a wail ago.
DIY 1167mW on the Left Arctic 758mW in the middle and 201mW DIY Red on the Right


I thought it was a difference between the A 130 Diode thats in the Arctic and the A 140 thats in the DIY in the video. But after further looking, the Lower the mW of the 445nm diode the deeper blue it is.
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