Run-Time Plot - StreamLight 4AA -7 LED

[Roy]

This battery runtime plot is for a Streamlight 4AA - 7LED light. Four Everactive alkaline batteries were used.

Equipment used is a 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 verticl axis is in mVDC. One mVEC is equavalent to 1 Fc @ 1 Ft. The horizontal axis is 30 minutes per division.

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


The runtime to 50% max brightness = 3 hours 47 minutes

 

[Doug S]

Roy, from the looks of the graph, those boneheads at Streamlight are still grossly overdriving the LEDs to the extent that for most of the battery capacity they are pushing enough current through the LEDs that they are past the current of maximum output. Can you take a look at the module and see what the value of the resistors is? At last I heard they were using 22 ohms for each LED.

 

[Bullzeyebill]

I have one of the first ones, little no resistance. Think I will try with NiMH's. Getting in some dummy AA's from CCrane> I may try one in StreamLight 4AA, or three lithium's.

 

[Doug S]

For those interested, here is a runtime done by CPF member Richard Hess. I recall discussing with Richard which version of the light was used and he was pretty certain it was the Rev 0 that used 12 ohm resistors. If so, it is surprising that Roy's test showed a shorter runtime. I assume that Roy's has the 22 ohm resistors which should have given a longer runtime. I would not have expected this much difference from the difference in battery type used.
rlhess runtime

 

[Roy]

I have no idea how old this light is! It was loaned to me by "kitelights" so I could run a runtime plot on it!

I can see one resister in the little window. The color bands are red, red, black, gold or brown (can't really tell the color). Anyone knoe the resistor color code?

I would not be all that worried about a one hour difference in runtimes. Different batteries could make that much difference. Also my test setup does not allow for much air flow over the light while it's being tested, so heat could be a problem.

 

[The_LED_Museum]

[ QUOTE ]
Roy said:
I can see one resister in the little window. The color bands are red, red, black, gold or brown (can't really tell the color). Anyone knoe the resistor color code?

[/ QUOTE ]
The resistor you describe is 22 ohms 5%. That last band is probably gold; as there is no brown for the tolerance band.

 

[kitelights]

This light was purchased from BrightGuy less than 30 days ago.

 

[Doug S]

Hey Roy, here is something that I think folks may find of interest. If you still have the light, how about a runtime with the same cell type but with a dummy cell installed. Apparently a number of folks are using this light with a dummy cell.

 

[Roy]

Sent it home yesterday.....sorry.....but then....I don't have any dummy cells since I sold the UBH kit.

 

[MrAl]

Hi there,

I know this was a rather old thread, but i was just
recently referred to it (thankfully) by Doug S and
i just recently bought one of these lights and although i
like the brightness the LED's are definitely overdriven.

I've measured 80ma per LED, which is far above the
recommended level (that's with four brand new alkalines).

It's interesting to compare the current per LED
with the level recommended by Nichia... 30ma is
the highest non-pulsed.


Take care and thanks for all the info,
Al