Lumintop SD75 Flashlight Review

This SD75 by Lumintop is a high output Cree XHP70 emitter flashlight with SO many features, including a built-in powerbank! Read on!

Official Specs and Features

Here’s a link to the Lumintop SD75 Flashlight product page.

Versions

I believe there have been at least two versions of this light. The original, and a “fixed” model, which addressed a charging issue. As far as I know, everything available today is the new version.

Price

Honestly, the best price I see for this light is [currently unavailable]. I think GearBest sent this one to me simply because I asked (enough times) for it, not because they’re looking to sell a bunch. (They currently don’t even stock it.) Special thanks to GearBest for that.

I believe retail was around $110 when it’s available.

Short Review

This light has a few quirks, but I can honestly say that I love this light. I can’t think of a large format light like this that I’ve liked better. I think this will be a perfect “lives in the car” light for me, particularly with the included car charger. The 700m of throw isn’t too bad, either. On my “flashlighty” scale, this one rates as “very flashlighty.”

Long Review

The Big Table

Lumintop SD75
Emitter:	Cree XHP70
Price in USD at publication time:	$110
Cell:	4×18650
Turbo Runtime
LVP?	?
Switch Type:	E-Switch
Quiescent Current (A):	?
On-Board Charging?	No
Claimed Lumens (lm)	4000
Claimed Throw (m)	652
Candela (Calculated) in cd (at 30s)	3320lux @ 6.022m = 120398cd
Throw (Calculated) (m)	694.0 (106.4% of claim)^
All my Lumintop reviews!

^ Measurement disclaimer: Testing flashlights is my hobby. I use hobbyist-level equipment for testing, including some I made myself. Try not to get buried in the details of manufacturer specifications versus measurements recorded here; A certain amount of difference (say, 10 or 15%) is perfectly reasonable.

What’s Included

Lumintop SD75
Carrying case
Wall wart charger
Car wart charger
Spare o-rings (2)
USB accessory light
Manual, etc.

Cells are not included in this package, but I believe there could be packages that do include cells.

Package and Manual

The light actually ships in a box, and then in the case as seen below. The briefcase is not wrapped with other protective material. The case does not have a lock.

A closed, rectangular silver metal case with reinforced corners sits on a weathered wooden surface. The case features a textured lid and two visible black hinges on the top corners.

A silver metal briefcase with a textured surface, chrome handle, and two latches is placed on a wooden surface. The words zeroair.wordpress.com appear along the left side of the image.

Inside, there’s a lot of foam for holding the flashlight securely. Note that the flashlight is stored with the body (cell area) separate from the head.

Product information leaflet for the LUMINTOP SD75 searching flashlight, detailing its features, technical specifications, and included accessories. Contact information and a QR code are present at the bottom of the leaflet.

A black Lumintop SD75 flashlight is shown with labels identifying the thread mounting point, power and USB ports, power indicator light, and the side switch. Insets provide close-ups of these labeled features.

Above is the (fairly short) manual. This is mostly a ‘spec’ manual and less of an operational manual.

Build Quality and Disassembly

The SD75 is very finely built. It’s probably slightly larger in the handle area than it could be, but there’s a very nice weight and balance to it. The threads are anodized and have minimal lubrication. Everything just seems to be done right with the build on this light.

A large black flashlight with a ribbed grip and textured body stands upright on a wooden surface. The background is blurred, showing part of a wooden structure with a white geometric design.

A large, black tactical flashlight is standing upright on a wooden surface outdoors. The background is blurred, showing part of a wooden structure with windows. The flashlight has a ribbed grip and wide head.

A large, black, textured flashlight stands upright on a weathered wooden surface outdoors, with a blurred wooden structure and window in the background.

A large, black flashlight with a ribbed grip and wide head stands upright on a weathered wooden surface, with an out-of-focus wooden background.

The tailcap is just that- a cap. It even has a window, which shows bits of the light that I’ll discuss later. It’s a nice touch, but I am not sure (especially since it’s not covered in the manual) the actual utility of this little window. Threads for the tailcap are anodized and properly lubed too.

Note that the cell tube is threaded the same on both ends, so it’s possible to put the light together incorrectly. Of course, it won’t work this way.

There’s enough tailcap around the bottom edge that the light tailstands with relative ease, and security.

The light comes apart in the following way.

A disassembled flashlight is displayed on a wooden surface, showing four main components: the lamp head, battery tube, battery holder with two cylindrical batteries, and the tail cap. The background is blurred.

Two cylindrical metal objects, one lying on its side and the other standing upright, are placed on a wooden surface. They appear to be flashlight bodies with visible battery compartments.

I didn’t pull apart the head, but I will likely do that. I’m interested to see what size driver this light has (if anyone knows, please say in the comments!). I’d love for this light to have a lower low, and like the body/size enough that I’d consider doing it myself.

Size

Officially this light is 248mm long, 89.9mm head diameter, and 52mm in the body diameter. Without cells, it weighs 831g.

A large black Lumintop branded flashlight is placed on a weathered wooden surface, positioned vertically with the lens facing up.

A blurred U.S. dollar bill lies on a wooden surface, partially obscured by a black cylindrical object viewed from above. The objects details are not fully visible. The text “ZEROAR.WORDPRESS.COM” is along the left side.

A $20 bill lies flat on a weathered wooden surface with a camera lens positioned upright, centered over the bill, partially obscuring the currency.

Make no mistake, it’s a big light. It’s an especially big light when considering it only uses four 18650s (not 8, as the size might imply). There’s a lot of mass in the head, and of course the tail has some charging features and two USB outputs. So there are reasons it’s quite large and has only 4 18650s. Below see a comparably sized (but 8×18650) light, the Tiny Monster TM38.

Two large black handheld flashlights stand upright on a weathered wooden surface outdoors. The flashlight on the right is bulkier, and both have visible buttons and textured grips. Background is blurred.

Two flashlight heads are shown on a wooden surface. The left one is facing straight forward, clearly showing its LED and reflector. The right one is slightly tilted, revealing a blurred view of its LED due to the angle.

Retention

The tailcap has two large loops which will hold a lanyard, as does the side. The side piece is a screw-in loop. Coupled together, they can make nice shoulder strap attach points. There is no shoulder strap included.

The side loop also unscrews, revealing a standard 1/4″ tripod mount.

No pouch is included.

A close-up of a black, metal flashlight head with horizontal cooling fins and a single flat-head screw in the center. The background is blurred.

A black metal flashlight with cooling fins stands upright on a wooden surface. A small silver screw rests beside its base. The text ZEROAIR.WORDPRESS.COM is visible along the left side of the image.

Power

Lumintop’s SD75 is powered by four 18650 cells. It’s a 2s2p setup, so it’ll work from just 2 cells properly placed in this battery carrier, however. I found that the carrier requires quite long cells. Below it can be seen with 4x 30q’s, but I’ve had to add a rare earth magnet to these in order to have them work. I used a magnet with my set of protected Efest Purples, too.

Managing low voltage within the light, and having a shorter cell holder would suit me much more – this could shave probably half a cm off the length of the light. That’s minor, but the light is already larger than it has to be….

A cylindrical battery holder containing three pink rechargeable lithium-ion batteries is placed on a wooden surface outdoors.

A cylindrical electronic component with a metal base and top, connected by four black rods, lying on a wooden surface. The ends have circuit boards with visible screws and a central circular contact.

Here’s the runtime of the SD75 with the above cells. I stopped the test around 100 minutes to test the cell voltage – at that time they were around 3.15V. I didn’t want to run any risks of over-discharging the 30q’s, so I went ahead and stopped the test there. The cell holder was still reading around 6.3V at this point, and when I did turn the light back on (as seen in the graph), the output was low, and higher modes couldn’t be selected.

Charging

Also, a huge feature of the SD75 is the onboard charging. Lumintop provides two plugs – one is a wall plug, and one is a car adapter (for a cigarette lighter). I still don’t have a way to log charging over a barrel plug, so I can only effectively report that charging does work.

You’ll see two female USB ports on the end, as well. One is a 1A port, and the other is a 2A port. However, in my testing, I was able to draw over five amps out of these ports (individually). So, these ports will be able to power whatever device you connect, most likely.

Below are the barrel plugs.

A black power adapter with a cord and plug is placed on a weathered wooden surface, casting a shadow.

A close-up of a black power cable with a barrel connector resting on a wooden surface. The cable casts a shadow, and the wood grain is visible.

Lumintop also provides an accessory light of sorts. It’s a (very toothbrush-like) USB-powered warm white, adjustable light. Great for low light needs – there are no modes, just on or off.

A blue and white toothbrush rests upright in a black holder on a wooden surface, with the holders cap placed nearby; the image is slightly out of focus.

A blue and white toothbrush is standing upright in the open battery compartment of a black flashlight, which is placed on a wooden surface. The flashlights battery cap is lying nearby.

User Interface and Operation

There is a single side e-switch on this light. The operation is simple, and there aren’t many modes.

Hold for on. Click to advance modes (L>M>H). Release on the desired mode. Hold for off. Light will remember previous mode, and start there on next “on.” Double click for strobe.

The USB outs also have a switch, too. This simply turns the USB ports on or off.

The switch is very nice – easy to find without looking, big enough to use easily, and not easy to accidentally activate. Note that there’s no electronic lockout – you’ll have to unscrew the body a bit in order to lock the light out.

Modes

Mode	Mode Claimed Output (lm)	Claimed Runtime	Mode Measured Lux
Low	150	50h	2020
Medium	1800	8.33h	12220
High	4000	2.68h	25100

LED and Beam

The emitter of choice in this big ol’ light is a Cree XHP70. It suits the light well, and while not really intended to be a thrower, does throw quite well (around 700m). The reflector is orange peel, and smooths out the beam nicely. There’s a very concentrated hotspot, but this isn’t a pencil beam thrower.

The accessory light is an unknown emitter, likely COB, and is nice and warm.

Beamshots

These beamshots always have the following settings: f8, ISO100, 0.3s shutter, and manual 5000K exposure. These photos are taken at floor level, and the beam hits the ceiling around 9 feet away.

A circular beam of light with a bright white center and a fading dark outer edge, projected onto a dark background. The text ZEROAIR.WORDPRESS.COM is visible along the left side.

A bright white circular beam of light is projected onto a dark surface, creating a halo effect. The watermark “ZEROAIR.WORDPRESS.COM” is visible along the left edge of the image.

A bright white circular beam of light is projected onto a wall in a dark room. The words “ZEROAIR.WORDPRESS.COM” are faintly visible along the left edge.

Tint vs BLF-348 (KillzoneFlashlights.com 219b version) (affiliate link)

I keep the test flashlight on the left and the BLF-348 reference flashlight on the right.

Random Comparisons and Competitive Options

The Acebeam K60 is a nice comparison to this Lumintop SD75. Higher max lumens, same throw, same cells and emitter, but it has a control ring instead of a side switch, and a tail switch. Also has more modes. I don’t love control rings, and the tail switch is a wash for me. I don’t need more lumens at the cost of nearly double the price, so the SD75 is a nice winner for me.

Conclusion

What I like

Size and shape
Output
On-board charging
USB output
Provided car charge adapter
Provided case, great for car storage

What I don’t like

Modes are not good – low isn’t low enough
Nearly as big as an 8×18650, but just 4×18650

Notes

This light was provided by GearBest for review. I was not paid to write this review.
This content originally appeared at zeroair.org. Please visit there for the best experience!
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