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Old 11-05-2010, 02:31 PM #465
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Wink Re: 1-1.2 watt 445nm lasers CHEAP $180

Sorry, just a precisation

Quote:
Originally Posted by 536616 View Post
What makes a good heat conductor : <- (i suppose you mean dissipator)
1 ) High area contact between the diode and the heat sink
More or less correct, this anyway improve the heat exchange from LD to heatsink

Quote:
2 ) Material of of heatsink (Metals with more free eletrons are better)
Better said, thermal transfer rate and density

Quote:
3 ) Black colours at the surface
Not necessarily ..... black can be good same as silver or any other color ..... also, depending from the environment, black can be worse than other colors (just think about a heatsink used in full sunlight for all the time ..... black adsorb much more heat from the sunlight than anything other, decreasing the dissipation capacity)

Quote:
4 ) and of course a bigger heat sink (able to hold more heat; reducing the chance to overheat)
Better said, a bigger surface of the heatsink ..... on heatsinks, that what cause heat exchange from the metal to the air is the surface exposed to the air ..... a full cylinder with 10cm of diameter, as example, is much worse as heatsink than a cylinder of the same lenght, with only 5cm of diameter, but full of fins so the total surface in contact with the air is the double than the first one .....



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Old 11-05-2010, 03:27 PM #466
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

Quote:
Originally Posted by Blord View Post
I would be worry if the host don't get hot. The heat must has been trapped inside and the diode will not last long.
Good point not many talk about.
I find it amusing when some folks brag because they feel little or no heat..... that could be a bad sign if the diode is frying on the inside and not dissipating heat to the body well.

------------------------------

My impressions of the Yobresal 1+ watt laser.....
I'm gonna write this assuming most who read this will have little or no background of lasers!

First of all, its a mean little buggar! BEEE Careful!

1. Not only is it quite light in weight, but its amazingly powerful..... I can't find anything in its class without nearly doubling the money!
For those of you on the fence about whether to jump because your not sure if your getting your moneys worth......let me ask a question..... Have you seen just one person come back and say it was lame and its a bad deal?
But just the contrary... everyone is rightfully raving over what they get in their hot little hands!.... Just go ahead and jump!

2. Heat dissipation is quite nice. Considering it has a recommendation to not run for over a minute, it doesn't come close to being "hot".... only warm.
And when you first turn on the laser, while you can tell the heat is coming from the front, the whole laser heats up at once rather than the front being warm while the back is still cold...... thats great!
As you hold it, your hand will dissipate the heat too.

If this were continuous duty "and its not" there is always a danger when the host is small if you turn it on an leave it on the counter.... then all it has is the air for heat to dissipate too.... you hand usually takes the heat better...enough rambling about that.

3. I can punch holes through black cd cases in less than a second.... it starts smoking instantaneously and you can write your name with constant movement across the surface as the smoke pours!
I focused it 30 feet away against my wall. This multimode diode going through this fully threaded 445 lens makes about a 3/4" line on the wall at that distance.
I walked over and put my hand behind the beam and I could only hold it there about 3 seconds.

I would not dare do this at closer than 10 Foot distances!
I accidentally put my finger in front of the beam just a millisecond while focusing once and after I jerked away, I literally smelt Protein burning as my flesh on my finger got toasted!
It never made a sore or blister.... I get I seared it all in one shot preventing infection.... LOL!

4. The lens is fully threaded and is slightly loose. As others have mentioned, I recommend a "single" layer of plumbers tape around the threads. If you use more than that, it will be harder to screw it back on and then when you loosen it, the thumb screw will come loose because its not glued.
I decided to put a tiny drop of glue on the edge of the threads where the thumbscrew goes on so I wouldn't have that problem..... the negative to that is that it will be harder to clean the lens with that on at some later date.....

5. I recently sold my 300mw Green Hercules laser. I cost me 1400.00. Its beauty of the beam and burning power doesn't come close to this little guy.... and the Hercules was a small baseball bat!.... the "only" advantage it had was being a single diode the dot was round at great distances whereas the multimode diodes produce a "line" that become apparent the farther you shoot.

But line or not, it burns!... if there was a way to force that line into a dot, it would burn even farther!
But the sheer power of this thing outweighs the green color of my Herc " green is normally more visible to the human eye than blue, and the dot "not being a dot".

At close distances even with your laser glasses on, the line is so short it looks and behaves and burns just like a dot anyway.

A few will wonder if they will need glasses with this.


Here's my take.
1. If your careful and don't shine into a mirror, prism, your chandelier, a drinking glass, or anything that could possibly send the beam back your direction for a direct hit into your eye, then you don't really need them "only" if you are are shooting into the distance to see the beam at night or hitting objects over 15 feet or so.

2. But as soon as you start needing to play and burn stuff up close, then you "do" need glasses!
The beam is so stinkin bright after it hits an object that you can't really see the dot for all the bright light.

The "good" thing about the bright light is that it forces you to squint and it constricts your pupil to limit light coming into the retina.
The "bad" thing is you can't see what the heck your doing. The focused beam that would look like a 1/16 inch up close with glasses on "as it hit an object" looks like a quarter with the naked eye from all the splatter of light!
While the human eye is much better at contrast than a camera, this truly breaches the limit of what you eye can handle for contrast!

In other words, not only is it dangerous and at best hard on your eyes and gives you a headache and makes you see funny after-wards from the retina saturation, but you can't really burn well without glasses "at least until you develop your focusing skills" because you can't see where the hotspot tip of the laser is actually at.

Yes, burning paper or popping balloons would be easy, but if you try to cut a match stick into or do anything detailed like burn your name in wood, your lost.


Lastly let me say.... as you show off your new toy many will want to play with it themselves.

Keep in mind its like giving someone a loaded gun!
If they are someone "like your kids" that you wouldn't hand a loaded gun to, then "don't!!!" unless your holding the laser at the same time in full control.

All it takes is a second to pull the trigger and take out the dogs eye!
These are only fun if your responsible.... just like guns!

Because of this sober reality, it will limit you as to where you can take it and play with it.

Thats the frustrating thing about powerful lasers... after a while, you will find you can't play with it as much as you thought.
I have the same problem with my .460 pistol or my 30-06 rifle! But man are they fun when you do!


But I promise you... take it to a fireworks display and you will steal the show!....I did it every year with my Hercules and this is more spectacular because of its power and size!

I still remember as one dad screamed at his kid...... "stop watching that laser and look at the fireworks!".... LOL! opps!
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Old 11-05-2010, 04:09 PM #467
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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Sorry, just a precisation
Ok.... you win =(
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Old 11-05-2010, 04:24 PM #468
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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Originally Posted by borgqueenx View Post
so all these 1w lasers in this thread get hot very fast?
Mmh, then i dont think its something for me.
Don't blow this out of proportion. The laser does not get hot. After about a minute runtime it is good and warm to the touch. It won't seer your fingerprints off or anything like that. You just need to give it a minute to cool down. There are minor trade-offs for having such power in such a small package. This laser is SMALL. It is the smallest laser you will find with this kind of power. It's meant to be light and portable, not a lab laser. The inner diode heatsink is thermal coupled very well with the host, so the heat transfer is very efficient. If I run a CPU cooling fan next to the host I can run it indefinitely if I want.

This may still not be the laser for you, but understand that the heating issue is not that big of a deal.
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Old 11-05-2010, 04:25 PM #469
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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5. ...the multimode diodes produce a "line" that become apparent the farther you shoot.
So even with the adjustable lens, a dot can't be produced? Am I seeing it wrong because of the video quality or does Zephyr's video in this thread show a round dot?
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Old 11-05-2010, 04:27 PM #470
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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So even with the adjustable lens, a dot can't be produced?
you can still adjust to a dot at near but at far u have to adjust to infinity
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Old 11-05-2010, 08:52 PM #471
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

I got mine yesterday and, to echo the basic sentiments of everyone in this thread:

IT'S AWESOME.

It may sound like a cliche, but if you could only ever have ONE laser, THIS is the one it should be.

Small, light, continuous on clicky-button, a tight, bright, focusable, very visible beam and with enough burning power to easily get even an experienced laserist into trouble.

There is no downside or "cons" to this thing. Yes, it gets warm after a minute or so of constant output, but only warm, not hot. And seriously, I can't imagine why I'd need to leave this running for extended periods of time! It's too strong for a laser show and if you leave it on for too long it's going to burn a hole in anything in it's way :-)

Last night when I was aiming it at various surfaces just to focus the beam, whatever it hit began to smoke, so you have to be REALLY careful not to aim it at anything important.

Even at 30 feet away, I put my hand in front of the beam and felt it get warm after a few seconds.

And the beam... the beam! Even in a well lit room during daylight hours, you can see the deep blue beam cut across the air and threaten to put holes in the wall. At night, it basically is a lightsaber!

Forget the Arctic, THIS is the "world's most dangerous laser."

And the best one you can get NOW at almost any price.
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Old 11-05-2010, 11:24 PM #472
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

I can't help thinking cylindric host and ribbed sleeve for heat dissipation.
Something like 1/10mm oversize, a set screw, and some thermal paste.

All I need is a job with a lathe available, and my laser arriving.
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Old 11-06-2010, 05:25 AM #473
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

Send me info on how to get one of these - dave44mag4u@aol.com Thanks
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Old 11-06-2010, 09:58 AM #474
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

Quote:
Originally Posted by borgqueenx View Post
so all these 1w lasers in this thread get hot very fast?
Mmh, then i dont think its something for me.

A copper module and heatsink would cost you a way more. 1min continous runtime for >1000mW is more than ok IMO!
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445nm >> Kryton Smooth by lazeerer peak@2075mW
453nm >> Lipstick by rhd peak@158mW
473nm >> Optotronics RPL-B peak@112mW
515nm >> Skylasers HL peak@41mW
532nm >> Novalasers Alpha HP peak@284mW
589nm >> CNI PGL-III-A peak@89mW
594nm >> Laserglow Rigel peak@4mW
635nm >> MXDL by DTR peak@38mW
642nm >> Saillaser peak@23mW
660nm >> CR2 by lazeerer peak@524mW
685nm >> MXDL by lazereer peak@42mW

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Old 11-06-2010, 10:43 AM #475
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

So, yobresal, I totally skipped most of this thread just to find out if you have any more of these? Yay? Nay? Lemme know boss.
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Old 11-06-2010, 02:06 PM #476
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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Originally Posted by Gsquared18 View Post
So even with the adjustable lens, a dot can't be produced? Am I seeing it wrong because of the video quality or does Zephyr's video in this thread show a round dot?
I know I wrote a lot, but I explained that up close the line is so short its basically a dot.... meaning the length equals the width, giving it the same properties as a dot.

When you shoot it into the sky at night you can bring the beam to where it appears as very tight.... the same as a dot... even though as witnessed when shooing a wall at 30 feet, you will see its really a thin line about 3/4" long at that distance.
Even that line at that distance gets very hot and I wouldn't recommend leaving it pointed towards a dark wall or object... my hand can only take about 3 seconds.
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Old 11-06-2010, 02:21 PM #477
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

you can feel more heat if your skin is dark in colour
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Old 11-06-2010, 02:25 PM #478
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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you can feel more heat if your skin is dark in colour
Yo baby!... never thought about it.. but I bet your right!

As awesome as this is for its size... we still want our cake and eat it too.....

I'll have to also get something thats even more portable.. something that can go in the front shirt pocket and appear as a pen.....

That will be much easier to take it wherever I go.

Too bad I don't see these powers in those sizes.. I expect its a battery issue more than anything.

I"ve seen close to 800mw which ain't bad though.
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Old 11-06-2010, 02:27 PM #479
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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Originally Posted by windstrings View Post
Yo baby!... never thought about it.. but I bet your right!

As awesome as this is for its size... we still want our cake and eat it too.....

I'll have to also get something thats even more portable.. something that can go in the front shirt pocket and appear as a pen.....

That will be much easier to take it wherever I go.

Too bad I don't see these powers in those sizes.. I expect its a battery issue more than anything.

I"ve seen close to 800mw which ain't bad though.
Pen size?! >1W?! ouch, gonna burn a hole in your pocket (literally)
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Default Re: 1-1.2 watt 445nm lasers CHEAP $180

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Originally Posted by 536616 View Post
Pen size?! >1W?! ouch, gonna burn a hole in your pocket (literally)
Better than having it go off in your pants!
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