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cloud11 30.5K Views
Sep 28, 2023 3:29 AM

Sofirn SP33S 5000 Lumen Flashlight w/ Battery (5000K or 6500K color temperature)

$32

$80

60% off
+ Free Shippingat Sofirn
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Deal Details
Sofirn has Sofirn SP33S 5000 Lumen Flashlight w/ Battery (Blue, 5000K or 6500K color temperature) on sale for $31.99. Shipping is free.

Thanks to Community Member cloud11 for sharing this deal.

Note: This product ships from China which can take up to 14-28 business days to arrive (reference). Due to National Day holiday, shipments are scheduled to begin shipping on October 4th.

Available:About this product:
  • Fitted with a 6500K or 5000K XHP70.2 LED with up to 5000 lumens
  • Can reach a maximum beam distance of 264 meters (866ft)
  • USB-C port that enables fast and convenient charging of the supplied high capacity 5000mah 26650 battery, it usually takes 3.5 hours to charge fully.
  • Made of an aviation-grade aluminum alloy and can withstand earthquakes, heavy rain, heavy snow, and other extreme weather events
  • Can be used as a power bank to charge other digital devices
  • 126mm/4.96" (length) x 36mm/1.42" (head diameter); portable and efficient multipurpose flashlight suitable for everyday carry
  • Package includes:
    • SP33S flashlight
    • Sofirn 26650 battery
    • Charging cable
    • O-rings
    • Other accessories

Editor's Notes

Written by jimmytx | Staff
  • Additional Information:
    • Refer to the forum thread for additional details and community discussion.

Original Post

Written by cloud11
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Sofirn has Sofirn SP33S 5000 Lumen Flashlight w/ Battery (Blue, 5000K or 6500K color temperature) on sale for $31.99. Shipping is free.

Thanks to Community Member cloud11 for sharing this deal.

Note: This product ships from China which can take up to 14-28 business days to arrive (reference). Due to National Day holiday, shipments are scheduled to begin shipping on October 4th.

Available:About this product:
  • Fitted with a 6500K or 5000K XHP70.2 LED with up to 5000 lumens
  • Can reach a maximum beam distance of 264 meters (866ft)
  • USB-C port that enables fast and convenient charging of the supplied high capacity 5000mah 26650 battery, it usually takes 3.5 hours to charge fully.
  • Made of an aviation-grade aluminum alloy and can withstand earthquakes, heavy rain, heavy snow, and other extreme weather events
  • Can be used as a power bank to charge other digital devices
  • 126mm/4.96" (length) x 36mm/1.42" (head diameter); portable and efficient multipurpose flashlight suitable for everyday carry
  • Package includes:
    • SP33S flashlight
    • Sofirn 26650 battery
    • Charging cable
    • O-rings
    • Other accessories

Editor's Notes

Written by jimmytx | Staff
  • Additional Information:
    • Refer to the forum thread for additional details and community discussion.

Original Post

Written by cloud11

Community Voting

Deal Score
+37
Good Deal
Visit Sofirn

Top Comments

johnchanman
47Comments
42Reputation
From what I understand the sc31 uses a sst40 LED which operates at 3v. Budget lights that use 3v emitters usually have a combination driver that's composed of a mosfet and a linear driver. This is commonly labeled as FET+1, or FET+ n, N being the number of AMC7135 linear drivers (they're usually 7135 drivers since they're simple, cheap, and commonly available). The 7135 driver only supplies 350ma so multiples are sometimes implemented for higher current needs. The mosfet portion acts as a light switch that pumps whatever voltage and current the battery is capable of supplying into the led. This is highly inefficient but allows a huge amount of light output with few and inexpensive components.. Dimming is accomplished by PWM. Full brightness pwm can only work so much, so at low brightness levels the linear driver takes over and acts as a variable resister. supplying whatever voltage the brightness is set at to the led while bleeding off the rest of the voltage as heat. For example if the brightness is set to supply 2.8v to the LED and the battery is currently at 3.5v, the linear driver supplies the 2.8v to the LED and burns off the excess 0.7v as heat. It's inefficient but cheap and reliable. Though depending on implementation the 7135 drivers may use PWM also, effectively acting like a mini reduced brightness FET of sorts.

The SP33S flashlight uses a XHP70.2 LED which operates at either 6v or 12v (not sure which for this particular flashlight, I know the Acebeam L35 uses a xhp70.2 in 6v configuration). This necessitates a boost driver that is capable of boosting the 2.7v-4.2v of the Li-ion battery to the operating 6v or 12v. These drivers are much more complex and expensive, but they have the advantage of being very efficient (upwards of 96% vs around 70% for linear drivers). And they are capable of maintaining constant brightness until the battery is empty. A FET driver, as usually implemented in more budget flashlights, can't do this as it is pumping whatever voltage the battery cell is at into the LED. So as the cell lowers in voltage, so does the light output of the LED. A fully regulated driver like a boost circuit doesn't care what voltage your battery is at, it'll just boost it to whatever voltage you set it to.

Now some more expensive implementation of linear drivers don't use PWM and instead use large high current capable mosfet in linear mode. Where any setting below full brightness, as previously explained, it supplies whatever voltage it is set at to the LED and bleeds off the excess as heat. And at full brightness lets the battery pump whatever it's capable of into the LED. This can result in some hilariously impractical but fun lights like the Emisar DT8. Which is a light slightly larger than a safety razor that can blow out 8000 lumens at startup...for like 10 seconds before it thermal throttles.
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killerrabbit1961
1.8KComments
341Reputation
This should help. https://www.olightstore.com/blog/...emperature
Go to Comment
cloud11
178Comments
377Reputation
The "6500k" and "5000k" refer to the color (kelvin) of the light. A 6500k is going to have a tint of blue while 5000k will be more white with a tinge of blue. Really a preference thing.
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66 Comments

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Sep 28, 2023 3:48 AM
3.5K Comments
Joined Feb 2016
dazedxxxSep 28, 2023 3:48 AM
3.5K Comments
How is this different from the (3) SC31's I got earlier this month... which I really like??
Last edited by dazedxxx September 27, 2023 at 08:50 PM.
1
2
Sep 28, 2023 4:05 AM
1.5K Comments
Joined Oct 2008
Smoke1234Sep 28, 2023 4:05 AM
1.5K Comments
Looks like there is a delay on the shipping because it's coming from China. Wont ship till after October 4th
Sep 28, 2023 4:08 AM
5.3K Comments
Joined Jun 2010
wpcSep 28, 2023 4:08 AM
5.3K Comments
I got an XHP70.2 flashlight and cars get mad at me because they are brighter than car headlights
1
Sep 28, 2023 6:14 AM
1.1K Comments
Joined Mar 2014
EpicDealzSep 28, 2023 6:14 AM
1.1K Comments
What is the difference between the 6500k and the 5000k?
Found this listed on Amazon and they sell 6500k and say it outputs up to 5000lumens. Just curious if anyone knows whats is the difference between them
1
1
Original Poster
Sep 28, 2023 6:18 AM
178 Comments
Joined Nov 2006
cloud11
Original Poster
Sep 28, 2023 6:18 AM
178 Comments

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Quote from EpicDealz View quoted comment :
What is the difference between the 6500k and the 5000k?
Found this listed on Amazon and they sell 6500k and say it outputs up to 5000lumens. Just curious if anyone knows whats is the difference between them
The "6500k" and "5000k" refer to the color (kelvin) of the light. A 6500k is going to have a tint of blue while 5000k will be more white with a tinge of blue. Really a preference thing.
3
1
Sep 28, 2023 1:01 PM
1.8K Comments
Joined Apr 2017
killerrabbit1961Sep 28, 2023 1:01 PM
1.8K Comments

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Quote from EpicDealz View quoted comment :
What is the difference between the 6500k and the 5000k?
Found this listed on Amazon and they sell 6500k and say it outputs up to 5000lumens. Just curious if anyone knows whats is the difference between them
This should help. https://www.olightstore.com/blog/...emperature
5
Sep 28, 2023 2:43 PM
40 Comments
Joined May 2022
bookmarkmywordsSep 28, 2023 2:43 PM
40 Comments

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What? Do I need another flashlight? The answer is no but my mouse cursor is instinctively hovering over the buy button.
1
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Sep 28, 2023 7:39 PM
55 Comments
Joined Sep 2019
BoastfulGuitar5553Sep 28, 2023 7:39 PM
55 Comments

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I have too many flashlights!
1
2
2
Sep 28, 2023 8:04 PM
1.8K Comments
Joined Oct 2011
avocetSep 28, 2023 8:04 PM
1.8K Comments

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I've actually used a flashlight to find a flashlight.
Yeah I have too many flashlights.
1
9
2
Sep 28, 2023 8:34 PM
110 Comments
Joined Oct 2011
PuppetSinSep 28, 2023 8:34 PM
110 Comments
Forgot to buy a diffuser for my SP36 so that was my excuse to buy that and because I love the blue color on this one lol
Sep 28, 2023 8:46 PM
955 Comments
Joined Jun 2007
ImGeoSep 28, 2023 8:46 PM
955 Comments

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$22 at aliexpress for black
1
2
Sep 28, 2023 9:25 PM
4.7K Comments
Joined Feb 2010
Splash15Sep 28, 2023 9:25 PM
4.7K Comments
Quote from ImGeo View quoted comment :
$22 at aliexpress for black
link? can only see the $40 ones.
1
Sep 30, 2023 1:48 PM
135 Comments
Joined Dec 2015
JonahthewhaleSep 30, 2023 1:48 PM
135 Comments
Arg. Just bought sp36. Need. This. One.
Sep 30, 2023 2:55 PM
20 Comments
Joined Mar 2020
nz5yptSep 30, 2023 2:55 PM
20 Comments
Amazon flagged it as "frequently returned item" don't know why. The reviews look good

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Sep 30, 2023 3:50 PM
135 Comments
Joined Dec 2015
JonahthewhaleSep 30, 2023 3:50 PM
135 Comments
Got one as a welcome deal for 24 in aliexpress.

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