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
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Top Comments
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.
66 Comments
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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
Our community has rated this post as helpful. If you agree, why not thank cloud11
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
Our community has rated this post as helpful. If you agree, why not thank killerrabbit1961
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
Our community has rated this post as helpful. If you agree, why not thank bookmarkmywords
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Our community has rated this post as helpful. If you agree, why not thank BoastfulGuitar5553
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Yeah I have too many flashlights.
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