01.01 SUREFIRE L6

[Britelumens]

Sorry, I didn't notice you used the shark with remora. :banghead:
Did you measure output current (going through the led) on high?

Hi Fred,

Yup, 0.86 amp ;)


With regards,
Jo @ Britelumens

 

[wquiles]

Very impressive build Jo :thumbsup:

Will

 

[cmacclel]

Nice build but then again you once again get into the extreme case of over taxing the components. :)

The Shark does not have thermal protection whats happening is your overheating a component(s) on the board causing the shark to shutdown.

When I built the run of Ostar powered MagLites I was using the MaxFlex set for 1000ma and was pulling 2.2amps on 3x 17670 cells and even with all the mass of the maglite and HUGE heatsink the light got hot QUICK.

Now if you used 4 cells you may be safe but 3 cells is pushing it as you found out :)

You have been building alot of nice lights BUT :) If it hasn't been done before there may possibly be a reason why :)

Mac

 

[Britelumens]

Hi Mac, my reply in blue

The Shark does not have thermal protection whats happening is your overheating a component(s) on the board causing the shark to shutdown.



I encountered that when running it on the highest setting, and was suspecting it as I did not remembered that the SHARK driver has any thermal protection. It's the switching IC that overheat cause the shutdown, so only momentary on the highest is recommended for this one.


When I built the run of Ostar powered MagLites I was using the MaxFlex set for 1000ma and was pulling 2.2amps on 3x 17670 cells and even with all the mass of the maglite and HUGE heatsink the light got hot QUICK.


It does heat up quick on the Ostar when running at highest setting no matter how big the heat-sink is going to be. It just a matter of time.
Momentary and sensible usage beat any heat-sink design I think :)


Now if you used 4 cells you may be safe but 3 cells is pushing it as you found out :)


I believe you are referring to the stress on the batteries life and not the cause of the thermal shutdown of the SHARK driver?



If it hasn't been done before there may possibly be a reason why :)

I'll reserve on this one :) but if you don't attempt. Would you have a chance to know WHY? :thinking:

That is when I see one light host with so many different build where members here progress to make a better light when reading about physical constraint or limitation like this for instant. That's positive.

After taking off the depth of the reflector, with limited rooms to work with. I'm actually quite please to be able to squeeze 1 SHARK, 1 Remora , with a short burst of more than 15W on an Ostar and more than 40 mins and some on medium. I could not ask more on this small light.


I appreciate your comment though.



With regards,
Jo @ Britelumens




Mac

 

[cmacclel]

Joe the problem here is with the batteries. R123's should not be used at 2 amps for safety reasons.

As for my 4 cell comment that was made towards the batteries and shark. With the voltage sag on 3 R123's at 2 amps the shark is probably only seeing around 10v and then having to boost that to around 21v is not recommended and is the reason why it shuts down in only a couple of minutes. With 4 cells you have better efficiency and the driver does not have to work as hard. Also the current draw of the batteries decreases as well.

Mac

 

[Britelumens]

Joe the problem here is with the batteries. R123's should not be used at 2 amps for safety reasons.

As for my 4 cell comment that was made towards the batteries and shark. With the voltage sag on 3 R123's at 2 amps the shark is probably only seeing around 10v and then having to boost that to around 21v is not recommended and is the reason why it shuts down in only a couple of minutes. With 4 cells you have better efficiency and the driver does not have to work as hard. Also the current draw of the batteries decreases as well.

Mac

Hi Mac,


I agreed.


With regards,
Jo @ Britelumens

 

[nailbender]

Hi Jo

I had an ostar 1.25 mag that I used a blue shark with remora powered by 4x 17670 and after about ten minutes the light shut off surprising but as mentioned on medium no problem.

Dave

 

[Britelumens]

Hi Jo

I had an ostar 1.25 mag that I used a blue shark with remora powered by 4x 17670 and after about ten minutes the light shut off surprising but as mentioned on medium no problem.

Dave

Hi Dave,


Appreciate that you come forward to share with everyone reading this thread your personal experience with the Ostar/SHARK :thumbsup:

IMHO while working with this combo so far and running tests, it seems to me that with higher voltage close to the working vf of the Ostar. We could get a longer "high" with the SHARK. Just a question on how long no one knows as I believe many of us have not run them on extended time. Even the designer might not know how long it would shut down with these high powered led as we do not expect them to run these test.

While boosting the voltage, the switching IC get heated up fast, and now the area of space where the SHARK is in come into play. The smaller the enclosure air space within the heat-sink, the faster it heated up. That is what I found out during bench test. Instead of making an adapter to drive with 4 li-ion ( 5 even better ) on this L6 of mine. It would be more interesting for me to be able to extend the run time thru a way or another while keeping it to be the smallest 3 x li-ion Ostar powered SF . At the moment I'm pleased with the current performance as I could not ask for too much for this sheer mass of L6 running an Ostar.


With regards,
Jo @ Britelumens

 

[Britelumens]

Hi Jo

........about ten minutes the light shut off surprising..........

Dave

Hi Dave,

I think you must be wearing a glove and with the winter weather that you are clocking 10 mins on highest setting. With a bench mock up of 3 li-ion battery sag at 10.6V @ 1.9+ amp. With just 8 mins, the host with the Ostar on is hotter than my 85℃ tea on my desk in my local climate :ooo:

With regards,
Jo @ Britelumens

 

[nailbender]

It was about 32 degrees
shoot I was using a 4x setup but honestly I don't know if it was the parallel black one or the white series holder that I was using that night I think the parallel one, I have it in what may be a FM cut down host that was finned and then finished and I used a modded cree heatsink that sits in the head so the fins definately helped and also definately kept the hands warm yet the handle was only slightly warm

There was a bit of steam coming off the glass :)

Dave

They do give off an amazing amout of light.

 

[maxspeeds]

Hi Jo,

I'm curious on how the Ostar performs with the Shark versus Maxflex? I recall you making Mags with Ostar & Maxflex drivers in the past. Are there any advantages to using the Shark with Remora over Maxflex?

Cheers,
Joel