Run-Time Plot - Nuwai 0.5 W 2xAAA

[Roy]

This runtime plot is for a Nuwai TM-311H 0.5W 2xAAA battery led flashlight.

Equipment used is an Extech Mdl 401021 Light Adapter into a Radio Shack 22-805 multimeter with a PC interface that is using Scopeview software (V 1.08).

The vertical axis is in 30mVdc/div and is equivalent to 30Cd/div. The horizontal axis is one hour per division.

Be aware that your actual battery milage may vary from that indicated by this runtime plot.

TM-331H 2xAAA Alkaline Batteries
The runtime to 50% max brightness = 6 hours 38 minutes

TM-311H 2xAAA L92 Lithium Batteries
The runtime to 50% max brightness = 9 hours 45 minutes

 

[Roy]

Here is the relative size of the Fire~Fly II, 1xAAA, and 2xAAA.

 

[LightObsession]

I just received four of these lights today and have opened one to try it and really like the initial output and the beam pattern (even though it's bluer than I'd prefer).

It is very disheartening to see that the output drops 11% in the first 20 minutes of use and 23% in the first hour of use using the alkalines. The back of the light package states "DC/DC circuitry maintains stable light output for maximum duration, light output does not drop off like and uregulated LED". The run time plot above suggests that the light isn't very well regulated.

It looks like I'll have to put $4 worth of L92 in the light if I want to maintain high output for very long. Oh, well.

 

[Glenn]

LightObsession,

I too was disappointed in the fast drop with alkalines.
NiMH may be a good option.
Although it is not as bright initially with them...it will probably hold it's brightness for longer due to the flatter discharge.

I wish Roy would do run times with NiMH. /ubbthreads/images/graemlins/icon23.gif

Maybe we should take up a collection to buy him a RayOVac IC3 charger and some batteries. /ubbthreads/images/graemlins/santa.gif

I would contribute for all that he is doing for us. /ubbthreads/images/graemlins/bowdown.gif

Glenn