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sid pileski
04-02-2009, 08:19 PM
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-1.jpg
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-2.jpg
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-3.jpg
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-4.jpg

sid pileski
04-02-2009, 08:23 PM
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-5.jpg
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-6.jpg
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-7.jpg
http://img.photobucket.com/albums/v108/sids32/LED%20LIGHT/LED-8.jpg

I used 3 round magnets to mount it to the machined under side of the head.
Eazy on, eazy off.

Sid

GKman
04-02-2009, 08:42 PM
That's great. Can you give us a source for the parts? Cocktail lounge lighting on a Kurt vise. They should buy that photo from you for a catalog cover.

tony ennis
04-02-2009, 09:08 PM
I wouldn't put one of those on my mill unless the lights looked like little chile peppers.

h12721
04-02-2009, 09:22 PM
Where did you put the resistors?
Hil.

sid pileski
04-02-2009, 10:14 PM
I put the resistors in the switch housing. I used a wall transformer for power.
The PCB was cut out of a sheet of material, double sided taped to a piece of aluminum.
The housing was machined from a hunk of ABS.
I works nice. Some shadowing. Good white light.

Sid

danlb
04-03-2009, 12:51 AM
That's great. Can you give us a source for the parts? Cocktail lounge lighting on a Kurt vise. They should buy that photo from you for a catalog cover.


The LEDs appear to be luxeon 1 watt units. There are 8 wired in parallel. They take about 3.2 volts at 1/3 amp each (well, 350ma) when used without a heat sink.

The power supply for this unit will need to provide at least 2.8 amps at 3.2 volts.


You can get the LEDs from several places. I know the guy who runs the Sandwich Shoppe and he is on the up and up.

http://theledguy.chainreactionweb.com/product_info.php?cPath=48_52_29&products_id=432

You can get knock off leds from Hong Kong a bit cheaper...
http://www.dealextreme.com/details.dx/sku.13613



Dan

lakeside53
04-03-2009, 01:34 AM
Maybe I'm out of date on this stuff.. but are these LEDs sufficiently matched to be able to run in parallel ?- i.e. do they each take the same current from a common power supply, or do they have a constant current source built in?

sid pileski
04-03-2009, 08:05 AM
DanLB- You are right on. I'm a mechanical engineer, so I had some help from tha EE's @ work. But, the numbers you quoted were spot on.
And, they are Luxeon LEDs. They go about $3-$4 each. We use them in some of our products. These were in our labs doing nothing, so I thought I'd put them to use.

Sid

davidfe
04-03-2009, 09:42 AM
The LEDs appear to be luxeon 1 watt units. There are 8 wired in parallel. They take about 3.2 volts at 1/3 amp each (well, 350ma) when used without a heat sink.

The power supply for this unit will need to provide at least 2.8 amps at 3.2 volts.

You can get the LEDs from several places. I know the guy who runs the Sandwich Shoppe and he is on the up and up.

http://theledguy.chainreactionweb.com/product_info.php?cPath=48_52_29&products_id=432

You can get knock off leds from Hong Kong a bit cheaper...
http://www.dealextreme.com/details.dx/sku.13613

Dan

Dan,

Where is the Sandwich Shoppe located? Looked at their web site and could not find it. Don't like eCommerce where sellers hide.

Thanks,

David

BTW, I have had extremely good luck with eBay. Specifically the seller -

http://myworld.ebay.com/dxy_dxyduan/

davidfe
04-03-2009, 09:45 AM
DanLB- You are right on. I'm a mechanical engineer, so I had some help from tha EE's @ work. But, the numbers you quoted were spot on.
And, they are Luxeon LEDs. They go about $3-$4 each. We use them in some of our products. These were in our labs doing nothing, so I thought I'd put them to use.

Sid

Sid,

What is the Luminous Intensity typically listed as mcd?

Great looking light.

A.K. Boomer
04-03-2009, 10:13 AM
Cocktail lounge lighting on a Kurt vise. They should buy that photo from you for a catalog cover.



They always look like that when you see them out and about -- then you get them home delivered and everything changes almost overnight:p

danlb
04-03-2009, 01:25 PM
Maybe I'm out of date on this stuff.. but are these LEDs sufficiently matched to be able to run in parallel ?- i.e. do they each take the same current from a common power supply, or do they have a constant current source built in?


The Luxeons are designated by brightness, color and Vf (aka voltage). As long as you are not trying to make them extra bright by raising the voltage/current above spec, you can usually safely put LEDS from the same Vf range in parallel.

The first link I posted is to LEDs of the same Vf. The second link will probably be all the same Vf, but might not be.

Dan

danlb
04-03-2009, 01:29 PM
Dan,

Where is the Sandwich Shoppe located? Looked at their web site and could not find it. Don't like eCommerce where sellers hide.

Thanks,

David


Wayne and Cindy run the sandwich shoppe out of their home in San Jose, Ca.

Much like LittleMachineShop grew from an enthusiast trying to help others, Wayne threw together the Sandwich Shoppe to enable other flashlight enthusiasts to buy hard to get parts. He's been doing that for 7 or 8 years that I know of.

Dan

lwalker
04-03-2009, 01:30 PM
Where is all the heat from those LEDs going? It looks like there is just bare FR4 substrate contacting the "heat transfer slug" under the LED. Are you running them at very low currents? If you run them at the normal rating you'll need to get the heat out of there or they'll die pretty quickly.

danlb
04-03-2009, 01:55 PM
Sid,

What is the Luminous Intensity typically listed as mcd?

Great looking light.


This was not directed to me, but I have a single LED mounted on my micromill. I just happen to have a light meter. :)

May little LED illuminates the table at 512 cp (candlepower) or 500,000 mcd. That's with the LED mounted about 12 inches from the vise.

To put that in perspective.... the workbench that is 4 feet below a pair of 40 watt florescent tubes is illuminated at around 450 cp.

The candlella, lux or candlepower reading depends on how much the light is focused. It's a reading of brightness at a single point.

A modern LED without a heat sink can not be run at full brightness, but will still output about 1/10 the light of a 100 watt bulb. The 100 watt bulb sends that light in all directions, but the LED puts it out in a fairly narrow area. This makes it appear brighter. When you consider that the LEDs in this case are being mounted within a foot of the work surface, the end result is an area that is much brighter lit than it would be if lit by a 60 watt bulb that is 2 or 3 feet away.

Dan

P.S. I could not find my documentation about heat sinking, but memory says that you can safely run 1 watt luxeons at 100 ma without heatsinking of any kind without damage.

sid pileski
04-03-2009, 09:19 PM
All- Just got back from a funeral.
Anyway, the lights are not heat sunk, except for the pcb,and whatever
might make it through the three magnets to the head. I've used this for a while with no issues. I'm not running them at full power. To do that I would need better heat sinking. I thought about leaving a copper strip in the middle to pick up the heat contact patch on the back of the LED, but maybe the next version.

Sid