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Old 07-14-2010, 04:04 AM #1
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Cool Direct-Drive 445 Host

This is my latest 445 build for long run times (15 min. or so).

I started with this mount for the Aixiz module:

It is a very tight press fit with thermal compound.
The back side of the Aixiz module has a generous amount of heat-conductive epoxy in contact with the aluminum heatsink.

The front aluminum disc is pressed tightly against the finned heatsink shown in this photo:


The battery is a brand new nickel-anode hi-voltage 2800mah 18650 for long operating cycles.
Operating current is 600ma with Direct-Drive to the diode.
Efficiency is the highest possible, since there is no driver consuming power.

Lens is my Hi-Power 445 with stainless aperture to reduce wings.
This lens provides maximum power output for a set current (~520mw)
Here is a beam shot slightly defocused for best pattern:


Of all the lasers I have built, I like the dynamics of this host the best:

"Strong Light !" indeed.

LarryDFW


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Last edited by LarryDFW; 07-14-2010 at 04:18 AM.
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Old 07-14-2010, 04:12 AM #2
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Default Re: Direct-Drive 445 Host

Very nice indeed Larry!

I like that host as well. It looks like with the finned heatsink and ventilation holes it will provide maximum cooling.

Do you have a link for that host? Every time I look it up at DX it states "temporary out of order" which says to me they won't be getting it anymore.
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Old 07-14-2010, 04:28 AM #3
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Default Re: Direct-Drive 445 Host

I buy them in quantity thru a broker, for my 6-watt UV LED lights that I sell commercially.

My next build in this host will be the hi-power Casio Red LED I got from Daguin.

I have been playing with current levels,
and flooding my work area with the very intense Red beam.

Not a laser, but still hard to look at !

LarryDFW

P.S. I can provide the finned-host, if you don't find it.
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Old 07-14-2010, 06:57 PM #4
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Default Re: Direct-Drive 445 Host

DealExtreme: $111.23 RaidFire SpearTM Cree Q5-WC 250-Lumen LED Flashlight (1*18650)
this is the light right?
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Old 07-14-2010, 07:15 PM #5
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Default Re: Direct-Drive 445 Host

Quote:
Originally Posted by LarryDFW View Post
My next build in this host will be the hi-power Casio Red LED I got from Daguin.
I have been playing with current levels,
and flooding my work area with the very intense Red beam.
Not a laser, but still hard to look at !

LarryDFW
I would be VERY interested in your work with this. These red LED's just keep piling up

Peace,
dave
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Old 07-14-2010, 08:28 PM #6
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Default Re: Direct-Drive 445 Host

daguin, what are you thinking about?

the close relative to this LED, the white SST-50, is already being used in a few portable hand-held flashlight builds. Might be easy to put it in a maglite.
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Old 07-14-2010, 08:46 PM #7
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Default Re: Direct-Drive 445 Host

Quote:
Originally Posted by BShanahan14rulz View Post
daguin, what are you thinking about?

the close relative to this LED, the white SST-50, is already being used in a few portable hand-held flashlight builds. Might be easy to put it in a maglite.
Just thinking about playing with one of these LED's

I am a clueless NooB when it comes to most electronics and LED's in particular. Can you give me a link?

I'm sure that I can search it up from the "SST-50" model you gave, but if I can be a bit lazy, I could use it right now

Too many projects on the workbench (and too many students that are not ready for college in my summer session classes)

Peace,
dave
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Old 07-14-2010, 08:54 PM #8
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Default Re: Direct-Drive 445 Host

Quote:
Originally Posted by daguin View Post
Just thinking about playing with one of these LED's

I am a clueless NooB when it comes to most electronics and LED's in particular. Can you give me a link?

I'm sure that I can search it up from the "SST-50" model you gave, but if I can be a bit lazy, I could use it right now

Too many projects on the workbench (and too many students that are not ready for college in my summer session classes)

Peace,
dave
LEDs are just like a laser diode, except different casing (sold on "stars" - metal bases), not coherent, less sensitive to ESD, driven at higher currents, and more tolerance to temperature and over-currenting. They also run hotter on average.

Luminus are the company who produce these projector LEDs, other producers are Cree and SSC (Seoul Semiconductor). DealExtreme stock plenty of cheap but high-powered LEDs.


EDIT: Checking the LED model now...

I believe this is the model of Red LED: http://www.luminus.com/content1090 but I'm not certain.
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Last edited by charliebruce; 07-14-2010 at 09:01 PM. Reason: So many edits - I think this is all correct now.
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Old 07-14-2010, 09:27 PM #9
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Default Re: Direct-Drive 445 Host

If you search at cpf for sst-50 and sst-90, you'll find some info on people building with these high-output LEDs, but they are the white, domed versions. You will also find some people offering batches of 5A and 9A drivers.

This thread might be interesting, but you should do some searching, there's a pretty good google search there too.

Last edited by BShanahan14rulz; 07-15-2010 at 01:17 AM. Reason: bad info
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Old 07-14-2010, 09:33 PM #10
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Default Re: Direct-Drive 445 Host

im assuming theres a reason that it can be direct driven when usually its not advised?
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01010000011000010111001101110100011000010010000001 10111000100000011100110110000101110101011000110110 01010011101000100000011010010111010001110011001000 00011000010110110101100010011010010110011101110101 01101111011101010111001100100001
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Old 07-15-2010, 12:32 AM #11
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Default Re: Direct-Drive 445 Host

@BShanahan Are you sure that's the right LED? The one I have seems to be 2mm by about 2.7mm die size, making it a PT-54. I might just be measuring inaccurately. It's almost certainly nearer 3mm than 2mm on the longer side though. I also think I remember 8A continuous as being safe, but again I'm not sure where I heard that.

EDIT: I took a picture next to a ruler, and got 2.6mm by 2.05mm, by using photoshop's ruler tool to compare the die to my physical ruler. 2.7 by 2 seems to be the closest on Luminus' site.

@Fonduman "Direct drive" - you mean running it at its pulsed rating continually? It's because we don't generally require the full lifetime of 60k hours, so overdriving them might make them warmer and last less long, but it doesn't matter as much. I'd still run at a safe temperature and rated current, but maybe that's just me.
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Old 07-15-2010, 12:41 AM #12
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Default Re: Direct-Drive 445 Host

Dave;

The Red LED is on a nice copper heatsink.

But it is too big for nearly all hosts.

So the trick is to cut it down to size.

LarryDFW

P.S. I think Charlie is correct about the PT-54
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Old 07-15-2010, 12:47 AM #13
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Default Re: Direct-Drive 445 Host

I just checked it by photographing it and comparing with a physical ruler, that gave 2.64 by 2.05, which is closest to the PT-54's 2.7 by 2.
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Old 07-15-2010, 12:51 AM #14
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Default Re: Direct-Drive 445 Host

i thought without a driver you could get current spikes and stuff. and i guess theres the problem of the battery not being enough voltage and stuff, perhaps you just have the right power source for it.
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Jayrob SS 18650 kit, A140 diode at 1A putting out 900mW
100mW 532nm from dealextreme *broke*
500mW 532nm from O-like *lense dmg? down to 150mW with scatter*

200mW waterproof 650nm from O-like *outputting 210mW quite stable*
Plan to have soon:
1W 455nm from wicked lasers (ofc)

01010000011000010111001101110100011000010010000001 10111000100000011100110110000101110101011000110110 01010011101000100000011010010111010001110011001000 00011000010110110101100010011010010110011101110101 01101111011101010111001100100001
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Old 07-15-2010, 12:57 AM #15
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Default Re: Direct-Drive 445 Host

Since you already have one, I'm gonna say you're right. Too eager to post, my bad.
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Old 07-15-2010, 12:58 AM #16
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Join Date: May 2009
Location: West central Oregon
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Default Re: Direct-Drive 445 Host

Nice build Larry very interesting host with them cooling holes around the head it looks like it could be air cooled with a micro fan
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White Fusion Time Machine 445
473nm LRS-0473-KFM-00150-10 158.5mW Lab style
laser used in the making of the latest TRON movie

CNI PGL-III-C-589 125mW
520 in a SH-032
Viasho 532nm 500mW
CNI pen 532nm 84mW
The Violet Pip Squeek 45mW

_____________________________________
LOOKING FOR A HOST WITH PERFECT HEAT SINKING
order your C-88 Cu kit today !

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