I need suggestions on how to arrange the LEDS

[cdrov]

Hi, there, i have 20 CREES and i want to make a video light. So i would like to ask how close can i solder them and the most important is where can i solder them so that there would not be temperature problems????:mecry:

And the second questios is how to power them? From 3,6, 7,2, 12 or 14,4Volts? What driver any suggestions? I need runtime for more than an hour per set? Optics??

Sorry for the many questions i really need your help. Regards to all

 

[TigerhawkT3]

I've made a couple, but not with so many emitters.

http://www.candlepowerforums.com/vb/showthread.php?t=187912

I hope that helps you a bit. If you have any questions, ask either in this thread or the linked one.

 

[dom]

Optics are the way to go
These are nice -artifact free wide beam

LC1-M (diameter 21.5)
http://www.cpfmarketplace.com/mp/showthread.php?t=175502
http://www.cutter.com.au/proddetail.php?prod=cut789

Not sure what you would power it with but maybe a couple of these would do the job
http://taskled.com/techcchipo.html

Looks like you could power 10 at 700ma with a 12V battery(or higher) at 89% efficiency with one of these drivers.

If you stuck them on a 10mm or more thick aluminum plate 110 mm X 90mm and had a big 12V computer fan stuck on the back of that -you'd have a beaut video light.

Cheers
Dom

 

[LukeA]

Optics are the way to go
These are nice -artifact free wide beam

LC1-M (diameter 21.5)
http://www.cpfmarketplace.com/mp/showthread.php?t=175502
http://www.cutter.com.au/proddetail.php?prod=cut789

Not sure what you would power it with but maybe a couple of these would do the job
http://taskled.com/techcchipo.html

Looks like you could power 10 at 700ma with a 12V battery(or higher) at 89% efficiency with one of these drivers.

If you stuck them on a 10mm or more thick aluminum plate 110 mm X 90mm and had a big 12V computer fan stuck on the back of that -you'd have a beaut video light.

Cheers
Dom

You'll want fins on the back of that heatsink to dissipate heat better.