#### gcbryan

##### Flashlight Enthusiast

Since there are 4 leds in a MC-E are they talking about 370lm x 4 or is this for the entire chip and therefore does this mean the max lumen is only achieved at 700 mA?

I'm also looking at the specs for a flashlight where it says voltage input is 6-16 volts and that it can use 18650 rechargeable or CR123a. It takes 4 CR123's and 2 18650 batteries.

The CR123's are 3.6 volt and the 18650's are 3.7 but there are only 2 of them.

Is this 3.6 x 4 =14.4 V and for the 18650's only 3.7 x 2 = 7.4 V ? How does that work?

I'm just trying to figure out how the numbers add up. In looking at certain flashlight specs with known led chips I'd like to know if it makes sense or not.

Thanks for any help you can provide. I've read a basic faq sheet somewhere on here about leds/bins/vf, etc but these questions weren't answered.