The Lumintop GT Nano is tiny, it’s modeled off the big BLF GT thrower that took 8 18650 batteries and came with a shoulder strap, the GT Nano looks similar but is smaller than your thumb. So you might be thinking something this small can’t possibly be functional right? Think again.
This light was provided for me for free by Flashlightbrand.com a newer reseller based out of China.
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Pickup the GT Nano from FlashlightBrand.com at https://www.flashlightbrand.com/lumintop-gt-nano-brass-everyday-carry-lights-450-lumen-keychain-flashlight-p3822334.html
10440 Tube https://www.flashlightbrand.com/lumintop-gt-nano-10440-tube-copper-brass-p3958893.html
Use Coupon Code LR10 for 10% off
Packaging & Accessories
Packaging here is a nice high quality box, and you get a number of accessories. Obviously the light itself, an 80mah button top 10180 battery, the recharger, a very short MicroUSB charging cable, split ring, lanyard and carabiner. There is an optional 10440 tube that you can purchase to run larger battery and more runtime but mine didn’t come with that. The light does come in black aluminum, titanium, and copper version too.
I will note my light didn’t come sealed in a vacuum bag to prevent patina like Lumintop does normally. I asked FlashlightBrand about this and they said they open them up to make sure they are working…… I let them know this is not normal and my light arrived with fingerprints on it and scratches on the tail. All of the studio shots of the lights in the video were taken as the light came out of the box. Hopefully they stop this behavior.
Construction & Design
The Lumintop GT Nano is basically an exact clone as the larger BLF GT but just scaled down here significantly. I am not going into extensive descriptions here as the video and pictures will do it justice. There is a bunny logo on the tail inside the recessed area on the tail. The button here does seem large but that’s just because it’s such a small light. The front bezel does unscrew by hand easily it does have a AR glass lens and smooth deep reflector. Internally the head has just a center post, and the tail has reasonably long spring for the overall size of the light.
Retention
For retention you do have a small lanyard attachment point at the tail. A lanyard and split ring as well as a small keychain carabiner is included here.
Size & Weight
I measured the length at 54mm, max diameter at the head at 24m, and diameter of the body tube at 14mm.
Weight with the battery installed is 1.74oz or 49.4g. The light is IPX8 water rated.
LED & Beam
The GT Nano is running an Osram Flat White emitter the actual model is a CSLNM1.TG quite a mouthful. It’s a great choice here. On my Opple meter measured a CCT of 7289 and CRI of 71. Neither are very surprising.
The beam pattern here isn’t the most beautiful but for what it is it’s ok. You have that very hot small center, and then in the spill there is a notable ring and some minor artifacts further out. It’s no surprise there is PWM here it’s pretty fast, here are some visualizations.
The driver here appears to be unregulated with the manual warning not to exceed 2.4A of draw. With the 10140 battery this isn’t an issue, but if you do buy the 10440 tube make sure you throw a battery of the proper maximum output in or you risk damaging the driver. With the LED under the switch and such a small battery it would be best if you mechanically locked the light out when not in use.
Official Outputs are listed at 450 lumens with a throw up to 300 meters;.
Night Shots can be found in the video version of this review.
Runtime & Heat
With an 80mAh battery in this configuration runtime were never going to be anything super impressive. That said I feel like a maximum useable runtime from turbo of 24 minutes is decent. The brightest of that output lasts for the first 8 minutes as you can see in the graph. The peak in temp was about 38C after about 8 minutes. The brass here does a good job of holding heat. .
I did a second runtime test in stepped mode 3 of 5 so a medium output and it was able to hold the brightest of that mode for 17 minutes before stepping down and ending at about 28 minutes.
UI
The GT Nano is running Narsil M version 1.3. Narsil is kind of old firmware at this point and something I haven’t seen on a light in a few years. It’s nice firmware but kind of complicated with all it’s different configuration options. I won’t go into those but I will link to a chart that explains it.
What you need to know for the GT Nano is it ships in ramping mode. Ramping mode is good, and fast. You can change it to stepped mode if you wish which is how I tested in my runtime graphs but for general operation I prefer ramping. Switching between them is easy, with the light on press and hold for about 3 seconds the light will flash twice pause, and then blink once. It’s easiest to then just let the light exit programming by putting it down for about 45 seconds.
Recharging
The light comes with it’s own charger and it’s neat how it works here. It looks like a lanyard bead with a MicroUSB port on the inside but upon further investigation the end with hole unscrews and you actually unscrew the tail of the light that holds the battery and then screw the side with the USB port into the tail of the light with the battery and your in business. The white plastic dome is the charge indicator here, red charging, green charged. This only works with the 10180 battery, if your running a 10440 you need your own charger. I am using my Vapcell S4 Plus because I can manually select a low charge speed of 250mA.
For an 80mAh battery, you want to charge very slowly, and it does this at 0.09A, so charging here takes about 90 minutes. LVP was measured at 3.33v and full at 4.14V.
Final Thoughts
A lot of tiny flashlights are gimmicks but the Lumintop GT Nano is the real deal. I am frankly quite amazed at how well this actually works. It throws an impressive distance especially for it’s size. Most of the time throwers are larger because that larger head works better for throwers, but here its quite small. That said with an 80ma battery your run times are very short and for that reason it kind of is a gimmick, so for that reason spend the few extra dollars and make sure you get yourself the 10440 tube too so you can increase that runtime.
Pickup the GT Nano from FlashlightBrand.com at https://www.flashlightbrand.com/lumintop-gt-nano-brass-everyday-carry-lights-450-lumen-keychain-flashlight-p3822334.html
10440 Tube https://www.flashlightbrand.com/lumintop-gt-nano-10440-tube-copper-brass-p3958893.html
Use Coupon Code LR10 for 10% off