How much voltage is too much? SSC P7 LED

[chrisdelaney77]

Hey, hoping someone who knows their stuff can help.

I have a LED (SSC P7) light that runs on a 8.4V 4.4AH Lithium battery. It works like a treat.

I've got a couple of other battery packs (from previous lights) that are 11.1V 5.0AH Lithiums. My question is, will this battery pack fry my LED?

If it's going to fry, second question - is the AH's of V's the problem. Could I reconfig my battery pack to a 7.4V 5.0AH pack?

Cheers for any advice.

 

[LEDninja]

8.4V direct driving an SSC-P7 will fry the LED. So there is a driver between the battery pack and the LED. Check the specs on the driver.

(you may get away with putting 8.4V on an MC-E if the MC-E is wired 2S2P.)

 

[Starlight]

To answer your other question, if there is no driver, the higher voltage is what will fry the LED. Think of AH as gas in your tank, it affects runtime.

 

[chrisdelaney77]

Hmmm,

Been searching around and cannot find any info on driver.

Here is a bunch of info on the light, also a couple of images added that show the internals... not sure if they give any info on driver.

http://www.dealextreme.com/details.dx/sku.25149

If anyone can help that would be great, if not I'll reconfig by battery pack to 7.4V and see how it goes. I'm guessing when an LED is run at a lower voltage it's not as bright?

Cheers

 

[LEDninja]

Your current battery pack is 7.2V nominal, 8.4V hot off the charger.

When you reconfigure your other pack to 7.2V you are providing the same voltage and light level should be the same.

 

[chrisdelaney77]

Thanks so much - will change my battery pack around.

 

[bobrez]

Learned the hard way today, that xpg straight to 12v leadacid didnt even blink. Forgot where that electronic thingy went.

 

[MikeAusC]

Learned the hard way today, that xpg straight to 12v leadacid

Why did you do that ? Have you come across any lights that drive an LED directly from 12 volts ?