What's the peformance/safety difference between adapters: 3'AA'x3 or 9'AA'x1 or 3'D'

Hi,

I have a project where I am going to use a Downboy 917 (ver 3) in a 3 'D' Mag powering a Seoul LED and I have three battery combinations I am considering. I want to know what the best combo setup for runtime, etc. is. Since I am using the DB, I am assuming that the brightmess will not be affected when in regulation with any combination.

First battery setup:
3 x 'D' (1.5v alkaline battery)

Second battery setup:
3 x 3 'AA' to 'D' adapter (1.2v rechargeable) (three separate 'D' size adapters)

Third battery setup:
1 x 9 'AA' to 'D' adapter (1.2v rechargeable)

Re: What's the peformance/safety difference between adapters: 3'AA'x3 or 9'AA'x1 or 3'D'

assuming that the 2nd and 3rd option remains a series circuit, voltage is cumilative and current is a constant, that being the case you will have 10.8v as the input voltage and i assume that the driver you're using can handle that kind of input but will produce a shorter running life as the average amps (current) in a AA Ni-Mh is ~700mAh. the 3xD alkalines in the first example will produce 4.5v but will have a ~1200mAh of current resulting in a longer life span.

which is important, brightness or longivity? if you want both, the batteries will have to be reconsidered. if the driver is designed to step up the voltage, i would go with the 3xd as that would get the best bang for buck but all relative to what the minimum input voltage of the driver will be

Re: What's the peformance/safety difference between adapters: 3'AA'x3 or 9'AA'x1 or 3'D'

Well, I will be using the Downboy 917 which is a buck circuit that can handle 3-16v in regulation. Since the DB regulates the amperage to the LED, I am assuming that the brightness is going to be the same anywhere from 3-16v but the only thing that would be affected is the longevity. Am I right?

Also, setup #2 would be a seris circuit I believe. It will be three independent 3 cell series modules in series with each other so the end result of the circult will be as if there were three 3.6v cells in series (3x1.2v=3.6, 3.6x3=10.8v).

Setup #3, would be a single in series cage (9x1.2v=10.8v).