Review-Comparative: Acebeam K70-Thrunite Tn42

Then I will make a comparison between two new models of flashlights that compete by is the “King Throw” of the headlights of series, the Acebeam K70 (known in these parts thanks to the excellent work which made UPz and subsequent contributions from Lfatman) and the TN42 Thrunite.

Acebeam took advantage of the characteristics of XHP35 Hi led and was ahead of the competition with its new model K70. A flashlight monoled and multibateria capable of 1300 metres and 2600 lumen according to specifications. Impressive figures, which added to its magnetic ring make this model a set of hard to beat.On the other hand Thrunite just bring to market its TN42 model, in two versions, one of them rechargeable with included battery pack. Brand announces a release of 1550 meters, which makes it a priori in the new Queen of pitchers, but beyond this particular detail to overcome the K70 there are some things rather than just being able to go further, and that is what we will try to analyze from our humble opinion, in the present review-comparative.


Both models arrive home in a carton of enough resistance. The Thrunite comes in a normal box where we can appreciate the marking engraving, location of the company, and the chosen dye color data. The Acebeam is however a box type case with a handle that allows its transport very comfortably. In addition to the logo of the brand has recorded technical specifications.

Once opened them we see that both come perfectly protected by a shockproof material molds, as it could not be otherwise in models of Premium quality. In addition, the TN42 comes inside a small anti-static plastic protective bag. Once taken off the headlights of the container, we observed that both models bring different accessories. The K70 comes with Lanyard, a pretty good cover, rubber rear button, as well as joints. On the other hand, the TN42 comes with a tape to take subject of shoulder and joints and the push-button replacement. Both models come with manual and warranty card.

Construction Features

Little or nothing you can reproach them both models in terms of build quality, made of high grade aluminum, with lenses anti glare of tremendous quality, no doubt we can say that we we have two Premium models. That said, are two completely different flashlights as their design. If we start with the head, the K70 has a bevel clear and a large amount of sink fins. The TN42 is completely smooth in his head, appearing the first sink fins practically in the body of the torch, where is switch on ignition. Here lies one of the big differences, the TN42 operates through a central button, while the K70 used a magnetic ring. The most common area both models is the body and the Tail. Both bodies have an efficient Knurling, being thinner in the TN42. The tail of the headlights is very similar but yet we find a button that works as a lock in the K70, and in both cases allow the use in mode Taisland without problem.

In my opinion, the weakest point of his design in both models is that they rolled with relative ease, and the great virtue of both is that they are very ergonomic, rather than on models of this size and weight is very welcome. In hand do not seem large or heavy, or at least to me do not seem so after carrying them for an hour (all in relationship to compare, of course). In both cases access modes is extremely easy. The TN42 button is easily accessible through its localized, and the K70 magnetic ring, only I can say that it is my favorite. I already liked other models of Acebeam, but is that in the K70 have modified their design adding fins and is an authentic past, or at least to my seems it (for my taste to the magnetic ring of Acebeam only a small little screen that tells you the level in which you are missing (L1, L2, L3…).)

The next step is to remove the headlights to access battery compartment to analyze the quality of machining. New equality again in both models. The two have four battery holder (although as we shall see more later different operation). We see at a glance that the head of the TN42 is major and minor body where the battery holder is located. This is because the TN42 has the central button and the K40 blockade in the Tail. Both elements have a very equivalent quality, but I like more the negative of the TN42 springs and connectors for the K70 battery positive.

To analyze whether they supported batteries of different sizes, I’ve selected four models of different length including a protected. As we can see, the holder of the TN42 perfectly supports batteries of all types, admitting without having to force protected batteries. It is true that the NCRBL could keep them more firm, but nor is it falling alone.

The K70 battery holder, supports all types of battery very well. No objection.

In terms of machining are again before two models of very similar qualities.Threads are deep, and another thing they have in common is that they are perfectly lubricated. Despite the lubricant, we need to exercise some strength to unscrew and screw the body of both headlights, which indicates that the o-rings do well their work. In the K70 tail can also unscrew to replace if necessary button.

One of the things that has most caught the attention, is immaculately clean to both models come both the reflector and antiglare lens. Both models housed a perfectly centred XHP35 Hi. I don’t know exactly the reason why some brands use centering black-and-white other. In the case of the reflector, in what has size is concerned, the TN42 is enormous, so much that the great centering of the K70 seems small.

Size And Weight

At this size, I think that the K70 has its advantages, at least if what is sought is less weight and less size. In terms of weight we save 10% in relation to the TN32, length is lower ligerisimamente and somewhat is less thick.

Both models along with other headlights below to get a clear idea of what is its size.

User Interface

Both models have a fairly simple user interfaces, but as already left clear for me the magnetic ring of the Acebeam only is surmountable by the STR7 magnetic ring. All others I prefer Acebeam rings. This is also enhanced with a sort of fins or outgoing makes much easier changing modes in any situation. The operation is to simply go by turning counterclockwise the roulette to arrive to desired power, or from the off position, turn right to reach the strobe. As I have already said, a simple and small screen (type Imalent DN12), which indicate you the way in which you find yourself, together with any other additional information would make this UI a real hit (this is a very personal opinion). Following the K70, comment that incorporates lock on Tail, and low battery warning through rapid flashes of the flashlight.

Late TN42 incorporates a single switch which controls all the flashlight. By pressing once turned, and pressing once switches off. If with lit Lantern we have struck, we will be changing modes low to medium – high. If the flashlight off we keep pressed, you access Ffly. To access the mode turbo to do another double quick press double-tap fast, and from this mode to access the sling. This model has a blue light what indicates that the batteries are charging. When the indicator light goes to red should replace the batteries.

Distribution Of Modes, Performance, Runtime, And Thermal Management

Once the other three in my integrating sphere, we will analyze the results.Rather than nothing to comment that I have made measurements of the voltage of the batteries before and after the test. Despite the similarity of both battery holder, they work differently. The K70 used a configuration series. Before the test the battery holder gave a voltage 16.8 v, and at the end of the same voltage was 12V. In the case of the TN42 (2s2p), the initial voltage was 8.4 v and the end around 6V.

I want to comment that the K70 runtime test, usually you cut it according to him indicating the ANSI/Nema, but after a few minutes in which the Lantern indicated that the level of the battery was low I thought that it would not be by chance, and I think I was right because the voltage was already at the limit. The luminous flux of the lamp was still high, but I think that having it would have damaged batteries, and see that the flashlight warned. The TN42 alerts with red and short light when the battery level is low. In both models the batteries roamed the 3v at rest.

Below are the distribution of modes, and obtained lumen in my sphere integrative contrast and indicated by marks. In general say that the K70 obtains values below the specified, and the TN42 get them something above. Personally the distribution of modes of Acebeam, seems more successful but not is if it would be good idea sharing modes as well in a model of a single button as the TN42

Below is the Runtime level 6 Acebeam and Thrunite Turbo mode. As you can see, beyond the initial moment both models offer a very similar power delivery, feel more linear and somewhat higher that of the TN42. A curious difference is how both models modify their behavior when the battery begins to waver. The TN42 makes a stepdown and cut off suddenly. The K70 begins a gradual fall. Peaks sudden performance decline can be seen in the graph of this model. That’s because at that very moment is picked up a battery warning signal. Also seen as at the time of incorporating cooling performance rises in the two.

In relation to the cooling, in order to analyze the influence of temperature on the performance of these models, presents the following graphic in the know appreciate that TN42 takes longer to reach the temperature of cutting.

The following chart displays the Runtime in level four of Acebeam and thrunite high mode. The regulations are very similar, somewhat more Runtime for the Acebeam, and more power and absolutely linear regulation for the TN42.

Finally presents the results obtained with the luxmeter. Both models give very close to the specified digits. Since the inmates not only to be used in high mode, it is convenient to analyze their results in other modes.


The next step is to analyze the projections of the headlights. A priori, we should expect similar projections. In general I must say that his projection is intended to “flashaloholicos”. Tremendous launch, but not flood anything wrong halfway.Short, the problem is that the intensity of the Spot is such that is not perceived as it should be the rest of the illuminated area. In order to facilitate analysis of these projections has included another very common pitcher in the Forum.Olight M3X Javelot. The first images of projections are against the wall and on a portaangulos. The names of the models are under photos.


The following images are projected in the hallway of my garage. Measures approx 95 long, 6 wide, 4 tall. Flooded more or less equal, and well, the spot crashes against the door of the garage “virulence”.


The next thing is to bring them out in their natural environment, showing tremendous. A terrace 4 metres from the ground, in the middle of the night with different buildings at different distances. First projected over 230 meters approximately, with the following results.


As the projection of these models was still crashing with intensity on the building, try to locate another building in the environment at greater distance (720 m).

At this time I decided to make two types of images, with the objective of the camera trying to cover the largest possible area, and the second focusing on the objective to the illuminated building as much as possible. Unfortunately, the night was not easy, and still buy a few tripods in conditions. The image of the TN42 leaves blurred in the picture with the open goal, but helps us to see the area illuminated at that distance.



We have two excellent lights for use on which have been conceived. Where more launched is the TN42, but the difference on so far away is not the only reason to decide for one or the other. Of the Acebeam I prefer its blockade in the Tail, its magnetic ring, its progressive descent at the end of the runtime of life, its cast of modes, its ergonomics and its accessories. Of the Thrunite its indicator of voltage, which is more pitcher, I prefer its “linear total” regulation, thermal management and in this case your led dye. And that of one, I like it more doesn’t mean not of another like me.

At this point I think it is essential to also assess the factor price when buying one or another model.