REVIEW: Sofirn SD05 Scuba Diving Flashlight

With my plastic caliper, I measure the inner diameter as 21.6mm. I don't have that battery but you may be able to measure it yourself.

That is great to know! Thank you.

Hi! I recently bought a Sofirn SD05 flashlight for diving

1. I would like to know if these batteries are compatible with the SD05 flashlight and if they have plenty of capacity for light.
#1. Samsung 40T (4000mAh / 30A) >> 11.4Wh@10A / 10.0Wh@20A / 8.1Wh@30A
#1. Sony VTC6A (4000mAh / 30A) >> 11.0Wh@10A / 9.8Wh@20A / 8.3Wh@30A
#2. Samsung 30T(3000mAh / 35A) >> 10.0Wh@10A / 8.9Wh@20A / 7.4Wh@30A

2. Is a minimum of 40A or 48A required like Sofirn batteries? Is having fewer amps better for lower temperature?
# Sofirn 21700 4000mAh / 40A 3,7 V 10C
# Sofirn 21700 4800mAh / 48A 3,7 V 10C

3. What are the (Wh) consumptions of H/M/L modes in Sofirn SD05?

Thanks

@ turandot, 4000mAh batteries and above are what you want but compare the specified battery diameters of those in my review with the ones you're interested in. The Samsung 50E will fit fine.

The SD-05 can use ANY 21700, but for my personal preference I’ll take the 50G or another good HIGHER capacity battery (Vs. higher current batteries as turandot lists above).

The SD-05 is quite a good light above water too. I have been using one the last few months by the back door. It really throws better than I thought it would too. And the 21700 is a real plus. I like both the new IF25a and this “dive” light the most lately and the SD-05 doesn’t heat up as fast as the IF25a, but gets VERY close in beam-width and throw with one emitter (Vs the four in the IF25a).

I AM a real fan of this light and as a diver I am looking forward to “taking her down” this winter in Cozumel IF covid doesn’t *@$! that trip up like it did last month (when I got my SD-05 for THAT dive we canceled). :neutral_face:

The Sofirn brand has confirmed to me that I can use any 21700 batteries in the max length 71mm, max diameter 21.9mm

Ok, thanks!
What’s the difference between 48A max current output (Sofirn 21700 4800mAh / 48A) and 10A (Samsung INR21700-50E 5000mAh - 10A) max current output for flashlight operation (brightness, temperature,……)?

turandot, Welcome to BLF!!!

The A refers to the current (amperage) that the battery is rated to produce. In my example SD05, it doesn't pull more than 7.1 amps.

Perfect! Thank you very much.

Great review, Nachtfeuerzeug! :beer:

Thank you xevious!

- which is exactly why putting a 40T or other super high current battery in the light is fine and all; but your not getting any more output from the light over the average high capacity 21700 (which run around 10 amps continuous… covering the light’s max draw by almost 3 amps).

So why not add capacity? I ALSO can confirm using my Molicel P42a in my IF25a from Sofirn that it gets hot VERY fast compared to the 50G (which does get as hot, but not as quickly). :wink: I’m sure there is a “smidgen” more output on the Molicel, but I really can’t see the difference when I light up the back pasture with both the IF25a and SD-05 using the 50G (actually a wrapped 50G called an “Epoch 5k” from 18650batterystore- great company I’ve been buying from this year- ALL authentic and everything disclosed re. their own wraps).

Sorry if I missed it, but are these using 3V or 6V variants of the 50.2? Has anyone pulled the driver?

EDIT: Found this post here

Seems to be 6V… at least that sample was.

The newer version use the 3 volt 50.2.

Thanks pennzy!

Wanting to go high CRI… 144 was my only good option at 6V. 3V opens a lot of doors.

Anybody have information about the new SD05 SST70, and how it compares to the XHP50.2?

(Other than what’s on Sofirn website.)

I would imagine any reviews or beamshots on the website are from the XPH50.2

Seems like they ran out of XHP50.2 and changed to SST70.

They say better throw, it would be nice to see a comparison.

Hey Deeuubee, That's interesting about the SST70. According to Djozz test, https://i.imgur.com/3YlpAhC.jpg

and if the driver doesn't push that Luminus more than 8 amps, it should be quite similar. Perhaps a throwier beam!

Nachtfeuerzeug - Thank you for all the information. It’s overwhelming sometimes trying to figure changes out.

I think I’m just gonna have to guinea pig it. :slight_smile:

I bet it is quite a bit of tighter beam. Wouldn’t be surprised if its nearly double the cd/lm.