yomamaphat
Newly Enlightened
- Joined
- Oct 22, 2006
- Messages
- 8
I have an array of 6 K2s and 4 Royal blues. They are mounted to a heatsink using JB Kwik (Fast curing JB Weld). I'm having heat problems, I'm driving the LEDs at ~366mA. It seems I'm using more heatsinking than other people that are driving their LEDs harder and don't seem to have heat issues.
So I was looking for possibly causes, like not having my slugs electrically isolated. So I'd run my array and test voltage between the anode and the heatsink.
Here's the weird part though: When the array is cold and I've just fired it up I get ~8mV across there. I can get more voltage sticking my probes to my tongue. But when I let the sucker get hot, 10-20mins, I start seeing over 3 volts across the anode and heatsink. When it cools everything is back to normal.
I measured resistance in hot JB Kwik and it doesn't seem to be affected by temperature (Still insulative as ever).
Any ideas on this? I'm lost...
Thanks
So I was looking for possibly causes, like not having my slugs electrically isolated. So I'd run my array and test voltage between the anode and the heatsink.
Here's the weird part though: When the array is cold and I've just fired it up I get ~8mV across there. I can get more voltage sticking my probes to my tongue. But when I let the sucker get hot, 10-20mins, I start seeing over 3 volts across the anode and heatsink. When it cools everything is back to normal.
I measured resistance in hot JB Kwik and it doesn't seem to be affected by temperature (Still insulative as ever).
Any ideas on this? I'm lost...
Thanks