Fenix P3D runtimes

[qip]

i got a question...when anyone does a runtime test do you actually let the light run nonstop till batteries drain or is it done partially and calculated...cuz thinking about it ,low mode on said light shows 80+ hours low mode does that mean you ACTUALLY let it run 80 hours nonstop , then you got to do it for other modes and battery types , that could take months wouldnt it

 

[chevrofreak]

Fantastic runtime Charts CF!A coupld of questions what does a 17670 look like? Is it the same length as two x CR123's?Whats the advantage of using a single 17670 instead of two of AW's RCR123's?Now if only i could get one of these from the Japanese dealer, who's offering them with the Q2 Bin emitter and a textured reflector...

Yes a 17670 is a single Li-Ion that is the length and diameter of two CR123's.

The advantage is that they usually have a higher combined capacity than two RCR123's. They work fairly well in the P3D, but the lower voltage makes it not run as long in regulation on Max.

i got a question...when anyone does a runtime test do you actually let the light run nonstop till batteries drain or is it done partially and calculated...cuz thinking about it ,low mode on said light shows 80+ hours low mode does that mean you ACTUALLY let it run 80 hours nonstop , then you got to do it for other modes and battery types , that could take months wouldnt it

I run the lights non-stop, and yes it does take a very long time.

 

[brightnorm]

I have a question also: How do you keep the lights from overheating when you test them on max and high?

Brightnorm

 

[chevrofreak]

I have a question also: How do you keep the lights from overheating when you test them on max and high?

Brightnorm

I have a fan blowing on them from about a foot away. I used the highest speed for Max and High, medium speed for Medium, and low for low.

I used to not fan cool the lowest levels, but I use it as a safety precaution incase the light for some strange reason changes to a higher output setting while I'm not at home. I don't want something overheating and potentially exploding.

 

[taschenlampe]

My "low-tech" solution for cooling during runtime test's:



An aluminium board ~ 10" x 14" (normally used to defrost frozen food).
A frying pan - made of aluminium or cast iron – placed upside down will also
do the job.

A freezer bag with little water to ensure thermal contact between flashlight and
Aluminium board.
Little water - the flashlight should bear on the board and not float on the bag!

The flashlights stay very cool with this "setup"!


Tom

 

[BUZ]

Is it ok to run the p3d in turbo mode for and extended period or are there heat issues?

 

[kevtanusa]

Chev, the runtime were for 2x123 and 2x AW750mah lions ?? Can the P3D take the voltage of the 2 lions?

 

[4sevens]

Chev, the runtime were for 2x123 and 2x AW750mah lions ?? Can the P3D take the voltage of the 2 lions?

Those graphs in the first post are 2xcr123a and 2xrcr123.
Fenix specs state that it's fine with 2xrcr123. It's a buck circuit.
I've tested it up to 16v (unofficial )

 

[chevrofreak]

Is it ok to run the p3d in turbo mode for and extended period or are there heat issues?

If you are holding it and it starts getting too hot to hold, turn it off or turn it down a level. If it is mounted somewhere that it will get airflow, like the handlebars of a bicycle then it should be fine, but you can check by touching it to feel how hot it is. If you set it down, feel it occasionally to see if it is too hot to hold. If it is then you should turn it down.

 

[gunga]

Chevro, did you ever re-run the medium test with the RCR123s?

Strange results on that one!

:thinking:

 

[nanotech17]

Those graphs in the first post are 2xcr123a and 2xrcr123.
Fenix specs state that it's fine with 2xrcr123. It's a buck circuit.
I've tested it up to 16v (unofficial )

So one have to power up the P3D up to 16v to get 160lumens? :thinking:

 

[4sevens]

So one have to power up the P3D up to 16v to get 160lumens? :thinking:

No, please don't spread misinformation.

The P3D is a buck circuit. That means over 4.5-5v max puts out 160.
If you don't know what a buck circuit is, do a search on cpf.
At 16v, it draws a fraction of current compared to 6v, thus greatly
extending the runtime.

 

[chevrofreak]

Chevro, did you ever re-run the medium test with the RCR123s?

Strange results on that one!

:thinking:

I did, and the graph was very similar.

 

[jayflash]

Chev's results on medium were similar to my light using RCRs on low. With RCR123 cells the low was very noticeable lower than with primary cells. I preferred the lower output, myself. Except for low, all the other levels were close to equal output with either type of 123 cells.

The buck circuit is well regulated, drawing proportionately less current at each level with the higher voltage of the RCR cells.l

BTW, the old P1D is a poor candidate for RCR123 cells. All levels become almost the same in brightness and it draws more current for the same output.