Could I have fried a bunch of my LEDs?

[chriswf]

I thought hey, why don't I use a 9v battery to test my LEDs, because basically EVERYONE has mentioned bad LEDs no matter who you buy them from it seems.

So I tried searching on here. No one mentions how they test them.
So I figure, 9v battery for a smoke detector, direct current, should work.

Plugged it up to 1 LED and it flashed. Then the LED wouldn't turn on again.

Okay...

So I soldered a chain of LEDs together, like 6 or so.
Hooked them up to my driver (the 35-700 from Rapid LED).
They all flashed once, then turned off and won't light back up.

What's the problem?
Do I need a resistor or something?

[Ace25]

I would guess you fried it with a 9v battery. But if they flashed with the driver, that is a good sign. You need at least 8 LEDs in a row to test them with that driver, anything less and they won't work. To test individual LEDs you need 2 AA batteries (3v), not 3x that power (9v).

http://www.rapidled.com/aa-battery-led-tester/
http://cdn2.bigcommerce.com/server1300/f61b0/products/143/images/191/tester_large__65272.1310932774.640.640.jpg

[chriswf]

Well... What about when I plugged them up to the actual driver and they fried?

[Ace25]

The driver has built in protection, if there is too little or too many LEDs it won't fire up (just flash).

[Floyd R Turbo]

http://www.meanwell.com/search/LPC-35/default.htm

9v minimum output, so 6 LEDs should have worked fine if their Vf was 2V.

I think you blew them up by testing with a 9v battery.

[chriswf]

Fixed it :)
I did blow a few reds. My scrubber is built, pics incoming soon.

[chriswf]

http://algaescrubber.net/forums/showthread.php?2531-My-gutted-refugium-waterfall-ATS&p=29010#post29010
There's my somewhat finished product in action.