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Quote:
Originally Posted by mx4intx
There's a reason fo' dat.
No can!
Blues wants, 14.4V.
Reds, 10.0
Deep reds, 11.2
However, using an LM 317 current limit supply will only need about 2V.
headroom.
Find a 40V. 2A supply and throw 1. cheap, 3 terminal chip an; 1, resistor at it and you are done.
Need details? Jus' ask.
Aloha,
Weezard
Sounds like you are saying throw 40vdc into a lm317 and run it all in series?Quote:
Originally Posted by Weezard
I was also wondering how bad ass a heatsink would have to be to dissipate the heat if these were all mounted tightly packed together to act as more a single source of light?
Quote:
Originally Posted by mx4intx
Zackly!
Try it, you'll like it!:)
Aloha, Weeze
Mahalo Weezard! That makes it simpler. I have the LEDs in hand but nothing else yet. I'll be sure to post it all when it's done. I have been reading LED threads all over including this one twice and you've been quite the inspiration in a few of them.
300w packed into an 8.5x16x2.5 inch space took quite a hefty heat sink and heat plate and fans for me to get it stable and operational.Quote:
Originally Posted by mx4intx
Quote:
Originally Posted by mx4intx
I noticed that you did some reading before posting.:cool:
Can't tell ya how much that pleases me!:)
Mahalo nui right back atcha, brah.
You slogged through all dat mess, twice!?
You deserve a synopsis.:jointsmile:
The LM 317 is an easy beastie
Just hang a 1 ohm, 10 W. resistor in series with your load and tie the load end of the resistor to the Adj. pin.
[attachment=o265844]
It's actually a voltage regulator, but if we pull current through the resistor, the 317 will try to maintain a 1.2V. difference between its output pin and it's adjust pin.
To do so, it is forced to regulate the current for us.
Automagically adjusts all the junction drops for us too.
1 amp. is 1 amp.!
Or, in this case, ~1.25 A.:)
Max onna regulator, and emitters, is 1.5 Amp
I use a heatsink from a stereo power Ampilifier that I spotted in a dumpster.
One channel was fried, but the heatsinks were beeg!
And free!:hippy:
[attachment=o265845]
And, as it turns out, jus' da right size with a small fan.
I use a single muffin fan to cool the chips and the pwr. supply module.
[attachment=o265847]
Stripped them, polished, drilled, bolted 10. deep red 5W, stars onnem and 3 Royal blue, 5W. Ledengins.
Used dropping resistors for the first grow, then realized it was a great budding light and got serious about safety and longevity.
Retrofitted some cheap current regulation and relaxed a little.:rastasmoke:
[attachment=o265846]
Loaned it to a friend when I built da 2 beeg lights.
He grew fat buds with it!
Now it's back in harness for my momma plants.
Now, aintcha glad ya asked?;)
I'll be followin' your log.:thumbsup:
Aloha,
Wee 'zard
Nice! I am glad I asked. My big problem is finding a cheap small 40V 2A supply. I already have a homeless 19V 2.1A laptop supply. I may end up just splitting the blue and red into two independant strings.
That's what I ended up doing on one of the arrays.Quote:
Originally Posted by mx4intx
Used dropping resistors.:(
The laptop supplies are excellent and can mount piggyback on the 'sink.
Hope ya no mind if a watch.
Aloha,
Weeze
I think that this will take care of any cooling issues
used Aluminum Heat Sink 9 7/8" x 6" x 2 ", 388sq Dissip - eBay (item 180626613955 end time Feb-22-11 11:05:02 PST)
And I know I have some old pc fans laying around too. This will take care of the 24V
SCHIELE SYSTRON PS 24V 2.423.417.00 POWER SUPPLY - eBay (item 280618533522 end time Feb-18-11 10:27:33 PST)
Wont be too much longer before I start building this thing I hope.