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This is my try to replace the energy-hungry 150watt halogen floodlight I use for working on my lathe.
I think it went well..
I think it went well..
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Signing UpStep 1The parts
The basic components and electronics are from DealExtreme.com
the led
http://www.dealextreme.com/p/30w-2400lm-led-emitter-metal-plate-white-16v-18v-39959
the driver
http://www.dealextreme.com/p/2000ma-30w-power-constant-current-source-led-driver-85-265v-42746
the optics
http://www.dealextreme.com/p/59mm-20mm-15-120-degree-99-transmittance-glass-optic-13569
a PVC pipe, a pipe holder, a p4 heat sink and an old 24volt fan.
I suppose that connecting the led to the driver and mounting it on the heat sink with the optics is self explanatory so the photographs are enough.
the led
http://www.dealextreme.com/p/30w-2400lm-led-emitter-metal-plate-white-16v-18v-39959
the driver
http://www.dealextreme.com/p/2000ma-30w-power-constant-current-source-led-driver-85-265v-42746
the optics
http://www.dealextreme.com/p/59mm-20mm-15-120-degree-99-transmittance-glass-optic-13569
a PVC pipe, a pipe holder, a p4 heat sink and an old 24volt fan.
I suppose that connecting the led to the driver and mounting it on the heat sink with the optics is self explanatory so the photographs are enough.
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If we couldn't, then all advances in technology would die off and it would be such a dreary place....
Who wants to live in a hell-hole where nobody can do anything, much less think outside (or inside) the box and make fun stuff?
I have a belligerent drunk neighbor that forgets where the property line is on a regular basis so I build high power IR LED floodlights so the DA and Sheriff can go talk to him after they view the videos.
I saw a 3 million candlepower IR light on a chinese website, but I don't wanna blind the guy....
Safety first... second, third, etc.... ;=}
Is the LED driver fitted in the housing with everyting else?
How is the fan connected to the driver, is there an ekstra output for a fan (12V perhaps), if the driver voltage is not fit for the fan directly?
A bit clumsy sentance there maybe, but you probably catch my drift :-)
great build!
I've got a 20W LED emitter myself, i just need a bigger heat sync for it, as I watched the temperature climb up to 165F before i got bored of watching it...
First, the heatsink is undersized for 30W load without the fan. Second, at the great increase in temperature the LEDs not only put out less light but also permanently degrade, further reducing light output at the elevated temperature so you end up with a greater reduction in light output than the increase in power consumption from the fan... assuming you use a modest fan not some high current, high RPM model.
Yes you could just pick a huge heatsink, at great cost (unless it's scrap/salvage/etc), size and weight. For some uses that is a reasonable tradeoff, but for others it isn't.
about your led, cpu heat sinks with thermal paste work great! the pentium4 ones are the best,or from older amds since these got hot!
There are some unscrupulous heatsink sellers which tried to claim otherwise and testing shows their errors, which is why people running 60W+ CPUs at full load (so it was near, but seldom actually at 60W) opted for mid to higher quality 'sinks instead of just "any ... skt A heatsink".
However you do have a valid point about looking at the era a heatsink comes from as CPUs, on average, climbed in power but even then, in each era you have to discriminate whether a heatsink is tailored towards performance, or low cost and size.
For example a product you can buy today as current generation - Sempron 140, socket AM3 retail packaged heatsink can't cope with more than about 60W, if that. They economized it because Sempron 140 has a max TDP of only 45W, and in actuality that's the per-family wattage for their faster model semprons too so the real max wattage is even lower.
The same is true on many modern heatsinks though there is great cooling potential:$ on today's multiple heatpipe sinks often on sale/rebate for about $20, those are generally good for about 140W or more and can cool a 30W LED array passively (w/o a fan).
Very Awesome Though. Ive been looking into doing something like this, But with Multiple LEDs. I do wonder how efficient that LED is though. Current efficiency's are in the 77 lumen per watt range (or higher)
That mounting system is quite ingenious....Hmm Never though of using Pipe Holders.
About the efficiency, I have no way of measuring it so I can't tell you anything.
From what I have seen, multiple leds will probably work better because there will be less shadows when you work.