The one he linked will be more than enough.
i moded somewhat similar light, with fans, and xml. for 100w array you’ll need a lot more airflow, not sure if you can even make enough holes in dolphins body to let enough air in out. but may be you’ll invent another way of cooling that is more efficient and needs smaller space.
http://i876.photobucket.com/albums/ab324/alpg88/5mil/P1060667.jpg
http://i876.photobucket.com/albums/ab324/alpg88/5mil/P1060686.jpg
http://i876.photobucket.com/albums/ab324/alpg88/5mil/P1060688.jpg
http://i876.photobucket.com/albums/ab324/alpg88/5mil/P1060696.jpg
actually now that i think of it, you may wanna google “lux rc fb1” he build 60w light with active cooling size of a coke can. may be you can get some ideas from there.
I’m actually going to use a bigger torch now than the Dolphin. I might close this thread and start separate project threads once parts arrive.
I’m going to use similar cooling to you. I’ve got a great heatsink so will have to see how hot it gets through testing. I will be undervolting at about 29v so it will be safer than running at 34v.
OK so I did actually end up making this. As above realistically the dolphin was too small, I have a smaller LED and all the components to make it an LED torch I just haven’t done it yet. But I did make the big 100W LED torch.
So this is the torch I got, some ebay special, it’s huge, about 2.5 times the size of a Dolphin. It comes with a big H4 car type incadescent bulb, and honestly, it worked really well. Great throw, quite bright. It had 2x6v rechargeable batteries inside wired in series to be 12v.
I pulled all of that out.
http://i.imgur.com/xZoblp4.jpg
Here you can see my 12v 9Ah battery fits in nicely.
http://i.imgur.com/2h8zuAg.jpg
Test fitting the heatsink
http://i.imgur.com/nQ3rtUC.jpg
This is the “Boost converter” I forget the actual specs, but it can easily drive this 100W LED @ approx 30volts. It takes in 12v and steps it up to whatever you specify using the little dial. I found the optimal voltage was around 30v approx. as measure by my multimeter. I didn’t check amp draw.
http://i.imgur.com/DqCKLrz.jpg
Here is the LENS test sitting on the LED. Really I don’t think the Lens does much to focus the LED… it’s going to be massively floody regardless.
http://i.imgur.com/oUjS8Zi.jpg
Test fitting components
http://i.imgur.com/nUOJPq5.jpg
You can see from this angle the reflector does reflect some of the actual LED itself, but again, it’s got so much flood you hardly notice it.
http://i.imgur.com/su8B2sV.jpg
I had to cut out a section to make the boost converter fit
http://i.imgur.com/tqVawkE.jpg
Testing the wiring setup before putting it all in. Basically 12v comes from the batt to the switch, when the switch is thrown, 12v goes to the boost converter which sends 30v to the LED, and 12v goes from the switch straight to the CPU fan.
http://i.imgur.com/7VxmDr2.jpg
All together now. The little toggle switch works really well. If you flip the lid down it turns off.
http://i.imgur.com/5t7YzT1.jpg
This is my backyard with no light, taken from Nexus 5.
http://i.imgur.com/pNJqdLK.jpg
And this is with the torch on
http://i.imgur.com/9Qu1qtl.jpg
It’s pretty bright… it lights up the entire backyard like daytime. Massive flood light, not too much throw, but still pretty decent really.
Would I do this again? With the money I spent I could have probably bought some really nice torches, but this was fun. I haven’t had many actual practical uses yet, except during one storm we had. And I plan on taking it camping. I haven’t done a full discharge test with it, but I remember I calculated about 1 or two hours? Can’t remember exactly.
As I mentioned I still have other parts to make a smaller 20w LED dolphin torch. I will make it eventually and then compare the two.
Thanks for looking!
I haven’t read the thread closely yet, but I did just take a look at all the pictures. Looks like fun. Thanks for posting the writeup and pics! It sure doesn’t hurt to have a “wow” light which you can use to outgun more or less anything a regular person might show up with.