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Old 10-05-2010, 11:29 PM #1
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Default 445 Test Platform

I have built a little test platform for my projector build, using a 1W 445 fitted to a brass mount from Dave at PL, with a Glass AR lens. I was running this diode at 1250mA at max modulation, although now I have decided to limit that to 1000mA.

The beam in the image is defocused simply because when focused whatever it points at catches fire lol.

I am still to determine the final labbie build for this diode and my reds.
Attached Thumbnails
445 Test Platform-dscf3855.jpg   445 Test Platform-dscf3856.jpg   445 Test Platform-dscf3857.jpg   445 Test Platform-dscf3858.jpg   445 Test Platform-dscf3859.jpg  

445 Test Platform-dscf3861.jpg  


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Old 10-07-2010, 07:09 AM #2
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Default Re: 445 Test Platform

Does anyone here have a nice lab block design and/or milling capabilities?
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Old 10-07-2010, 07:20 AM #3
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Default Re: 445 Test Platform

i got one but its just a square of aluminum with a tec on it and a vga cooling fan + heatsink on top of that.
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Old 10-07-2010, 07:52 AM #4
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Default Re: 445 Test Platform

I am requiring a lab that will accommodate PBS also.
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Old 10-10-2010, 05:13 PM #5
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Default Re: 445 Test Platform

Heat can only travel so fast in a given medium. At some point the law of diminishing returns will limit how much power you can put into this diode before it kicks the proverbial bucket no matter how big the heatsink is.

I hear gold is a really good conductor. ;-)

Hey I wonder how good lead is? Seriously? It's pretty dense stuff it should transfer heat fast right? Gonna go look that up now.
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Old 10-10-2010, 06:28 PM #6
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Default Re: 445 Test Platform

dnar, that brass pillar is pretty neat, but it is limiting the heat transference. It can only transfer maximum at abt 90* downward. 45* each way from dead bottom. Then the width & depth of the pillar is a "critical orifice". The fan surely helps but it would be much better if it were drilled in the middle of the aluminum face in pic 4 of 6. You would have 360* dispersion and the fan then cooling the fins helping the top 1/2 out.
This would be way more efficient than the pillar. IMO
If the power wasn't wasn't so high it wouldn't be so critical. Bet those thin sides get hot fast. Removing the TEC and drilling it down through the top center would work better too.
You could let the flat face be the front and still have full fan cooling on the finned rear side.

I do like that beam shot!.
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