COB LED lighting and 9 volt battery

Thread Starter

Josh74

Joined Apr 21, 2017
2
Hi all

I need to make a lighting ring using a COB LED. The lighting must be bright and also last for a 5 hour period. What would you recommend as I can only use a 9V battery due to limited size of housing.

I have limited space of 48mm for the ring, and need a 20mm center clearance for a camera lens.

Thanks in advance
 

Dodgydave

Joined Jun 22, 2012
10,361
Then first select the leds that you want, noting their current drain, then select a battery with a Ampere hour rating that will give you that, you may find you will go for lithium-ion or nickel.

So example leds take 300mA, for 5hours, that's a 1500mAh battery minimum.
 

Thread Starter

Josh74

Joined Apr 21, 2017
2
Then first select the leds that you want, noting their current drain, then select a battery with a Ampere hour rating that will give you that, you may find you will go for lithium-ion or nickel.

So example leds take 300mA, for 5hours, that's a 1500mAh battery minimum.
Many thanks can you get a lithium battery as small as a 9 Volt?
 

Dodgydave

Joined Jun 22, 2012
10,361
Do you mean Physical Size, like a PP3?

At best a PP3 will be 850mAh, you're better going for the 18650 cells or lifepo battery.
 
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