Comparison Bailong Police BL-1837-T6 vs Bailong Police BL-1812-T6

The maximum range at which the flashlight provides any effective illumination of objects. Different manufacturers have different criteria for this efficiency when measuring ranges, and therefore it is only possible to unequivocally compare among themselves in range only models of one manufacturer. At the same time, this parameter allows us to compare models from different manufacturers with some certainty: for example, flashlights with a lighting range of 15 m and 100 m will clearly belong to different range classes, regardless of manufacturers.

Note that the range of illumination depends not only on the maximum luminous flux provided by the lantern (see above), but also on the features of its design: the narrower the beam is provided by the reflector of the lantern, the greater the range will be, and vice versa — scattered light does not spread far. Some models allow you to adjust the beam width depending on the requirements of the situation (for more details, see "Adjusting the focus").

It is also worth bearing in mind that models with the same claimed lighting range can cover different spaces. For example, a hand lamp (see Type) with a reflector diameter of 20 cm will be able to provide a wider beam than a conventional hand lamp with a 5 cm reflector. And although in both cases the objects that fall into the light spot will be illuminated in the same way, however, in the first case, the size of the spot itself will be larger, and the actual efficien...cy of the flashlight will be correspondingly higher (in light of the fact that it is easier to "feel" individual objects with a wide beam, especially at a considerable distance).

The type of batteries used in the flashlight.

The most popular nowadays are replaceable cells in sizes AA, AAA, C, D and CR123, replaceable lithium-ion 18650 batteries, as well as branded batteries. At the same time, some models from the latter category are designed for standard batteries for power tools and are supplied without their own power sources at all; such devices are commonly referred to as the so-called building lights. And here is a more detailed description of the different types of food:

— AA. Batteries, colloquially known as "finger-type" batteries. One of the most common sizes nowadays; such cells are available both as disposable batteries and as rechargeable batteries, and they are sold almost everywhere. On the other hand, in modern flashlights this option is less common than the more miniature AAA — the development and reduction in the cost of LEDs has made it possible to effectively use more compact power supplies.
Note that "finger" batteries can vary markedly in capacity; accordingly, the battery life of a flashlight with such a power supply will be different — depending on the brand of batteries (accumulators) used. Also note that the use of such cells (like most replacement batteries) is inevitably associate...d with additional expenses: you will either have to regularly buy fresh disposable cells, or spend money on a set of batteries with a charger.

— AAA. They are also "little finger" batteries — by analogy with the "finger" ones described above. They are also available in different formats — both batteries and accumulators — and in different capacities and prices. They are smaller than AA, which is why they are generally inferior to them in terms of capacity. On the other hand, modern LEDs often have enough of such power; and compactness is often more important than high capacity. Therefore, AAA elements in modern flashlights are much more common than AA.

— C. 1.5-volt cylindrical batteries with dimensions of 50x26.2 mm; approximately equal in length to AA, but much thicker, due to which they have a much higher capacity. Some time ago they were quite popular, but now they are used extremely rarely — mainly in devices where the dimensions of the case initially allow the installation of such power sources (a typical example is batons, see "Type").

— D. Cylindrical batteries, the largest (61.5x34.2 mm), capacious and powerful among the currently used 1.5-volt power supplies. Similar to the elements of type C described above, they are rarely used, mainly in lanterns that initially assume large sizes.

— CR123. Cylindrical batteries. They have a length of 34.5 mm and a diameter of 17 mm, due to which they resemble a smaller variation of type C, but differ in operating voltage — 3 V. In the battery version, they are marked as CR123A. In general, they are quite rare, mainly in hand-held compact models and key chains, as well as underbarrel flashlights for pistols (see "Type"); however, specifically among these categories, such batteries are quite popular.

— 18650. In general, nowadays, a whole family of batteries is produced that use a 5-digit marking — for example, 14500 and 17650. All of them are made using lithium-ion technology, and have a cylindrical shape and a voltage of 3.7 V; the marking indicates the dimensions of such batteries in diameter and length (see below for more details). Specifically, 18650 (diameter 18 mm, length 65 mm) is the most popular type of such elements — both in general and specifically among flashlights. This is primarily due to the combination of compact dimensions and fairly solid performance. At the same time, thanks to cheaper technologies, 18650 batteries can now be used even in low-cost models — including those initially supplied in the kit. However, anyway, it would not hurt to clarify the complete set of a flashlight with such a power supply separately — and this applies to both the battery and the options for charging it available “out of the box” (for more details, see “Packaging”).
In general, such elements combine the advantages of replaceable batteries and branded batteries. On the one hand, the power source is reusable; when the charge is exhausted, you do not need to spend money on fresh batteries every time; on the other hand, if desired, you can purchase several batteries and quickly change them as needed. And with a separate charger, you can completely reduce work interruptions to zero: while one set of batteries is in use, the rest can be charged.

— Accumulator. This option means that the flashlight uses a branded battery that does not belong to standard sizes (and in many models it is also non-removable). One of the advantages of such a power supply is that the user does not need to spend additional time and money on buying batteries: the power supply is initially supplied in the kit, and when the energy is depleted, it is enough to charge it. At the same time, the delivery set may include both an adapter for an outlet and a car charger (for more details, see "Packaging"). The second advantage is that branded batteries are often more compact and at the same time more capacious than replacement batteries; and in general, such a battery is easier to fit into the design of a flashlight (especially non-standard). Among the key disadvantages of this option, first of all, the impossibility of a quick replacement can be noted — usually, a dead battery needs to be charged, which takes time and a power source. In addition, having your own battery inevitably affects the cost; this is especially noticeable when comparing low-cost models of rechargeable flashlights with battery-powered counterparts. However, the difference in price can quickly pay off with intensive use.
A special case is the so-called "construction" rechargeable lights. They are produced mainly by large manufacturers of power tools (Bosch, DeWalt, Makita, etc.) and use replaceable batteries for tools of the “native” brand as power sources. At the same time, such a battery is usually not included in the kit — it is assumed that it is more convenient for the user to buy a battery on their own, at their discretion (or that the household already has a branded tool and, accordingly, a power source).

In addition, more rare and specific food options can be found in flashlights:

— AAAA. Batteries are even smaller than the "little finger" AAA — 43 mm in length and 8.3 mm in diameter. They are used in some thin compact format lanterns, many of these models resemble fountain pens in shape and size.

— Replaceable Li-Ion batteries with a 5-digit digital marking — similar to the 18650 described above, but differing in size. Specifically, among the flashlights you can find the following form factors of similar power supplies: 10180, 10440, 14430, 14500, 16340, 17650, 21700, 26650, 32650. All of them have a standard voltage of 3.7 V, and the size of the element can be determined by marking: the first two digits correspond to its diameter, the second two to its length (both in millimetres). The larger the battery, the higher its capacity and, accordingly, the power supply.
Separately, it is worth noting that the 14500 cells are identical in size to conventional AAA finger batteries, but differ from them in operating voltage. In some flashlights this difference is taken into account, and they can use both types of power sources (with less battery life and/or brightness when running on batteries). However, in general, the possibility of such a replacement needs to be clarified in each case.

— Series CR****. Batteries — "coins" of a characteristic disk-shaped form based on lithium technology (not to be confused with lithium-ion batteries — in this case we are talking about disposable power supplies). The numbers in the marking indicate a specific size — for example, the CR2032 marking corresponds to 20 mm in diameter and 3.2 mm in thickness. Actually, CR2032 is one of the most popular sizes of such batteries; besides him, you can find CR1220, CR1616, CR2016 and CR2032 in flashlights. All such power sources are mainly used in compact low-power flashlights, in particular, key fobs (see "Type").

— Series AG**. The "AG" suffix with a number (one or two) is used to refer to miniature alkaline manganese type disposable batteries manufactured by Seiko and some other brands. The larger the number in the designation, the larger the size of the battery: the smallest of these elements, AG0, have a diameter of 5.8 mm and a thickness of just over 2 mm, and the largest (of those used in flashlights), AG13, are 11.6 mm in diameter and 5.4 mm thick. The main scope of such elements is miniature flashlights, including key chains.

— Series LR**. In fact, it is a complete analogue of the AG series described above **; the only difference is that AG is a brand name, while LR is used as a common international designation. In addition, there is no clear relationship in this standard between the number in the designation and the actual dimensions of the battery: for example, LR41 is larger than LR58, and LR44 is larger than both of them. Actually, in modern flashlights there are mainly just LR41 and LR44; they are analogues of AG3 and AG13, respectively, and have dimensions (length / diameter) of 7.9x3.6 mm in the first case and 11.6x5.4 mm in the second.

— 3R12. Batteries with a voltage of 4.5 V in a case of a characteristic shape: almost square and flat (70x60x22 mm), with rounded corners and two contact plates in the upper part. They were originally created as batteries for flashlights, but nowadays they are used quite rarely due to their large dimensions, shape features and relatively small capacity.

— PX28L. Compact and at the same time quite powerful cylindrical batteries with a nominal voltage of 6.2 V. They are well suited for working with a powerful load, including bright LEDs, but in general they are not widely used, and therefore they are rarely used in flashlights.

— R20. Another name for replaceable cells in size D is, more precisely, for disposable salt batteries produced in this size (other designations are used for other varieties). Usually, flashlights under R20 are compatible with any type D elements, however, the ability to work with salt batteries (having a lower capacity than alkaline counterparts, and even more so batteries) indicates a good energy efficiency and economy of the flashlight.

— CR2. Relatively small batteries (length — 26.7 mm, diameter — 15.1 mm), originally created for compact "soap" cameras — in the expectation that one such element could replace 2 AA batteries. The designation CR2 is commonly used for disposable batteries, batteries of this size are usually referred to as 15270.

— From the cigarette lighter. Power from the car on-board network through the cigarette lighter (or an auto socket of a similar format) can be found in two types of lamps. The first is hand lamps and auxiliary lighting (see "Type") designed for use with or near the vehicle. Most of these devices only work when connected to the cigarette lighter, and a fairly long (several metres) wire with an appropriate plug is responsible for the connection itself. The second option is miniature models (manual compact type and key rings) of “automotive” specialization. Such devices are equipped with their own batteries and are able to work autonomously, and the cigarette lighter is used to charge the battery — and the flashlight body itself plays the role of a plug (in other words, to charge, just insert the device into the cigarette lighter socket). However, both varieties are rare nowadays: in the case of lamps, the wire significantly limits mobility, and in the case of small flashlights, charging from the car network is not so often required. And even in the latter case, a more practical, versatile and convenient option may be a traditional rechargeable flashlight, supplemented by a car charger (see "Complete set").

- Flashlight charger. A device for charging batteries directly in the flashlight. Note that models with both non-removable and removable batteries can be equipped with such a “charger”. In any case, such devices are extremely easy to use: you do not need to remove the batteries and put them in a separate device, just connect the flashlight to an outlet, auto outlet or USB port (memory devices can use different power sources, this should be specified separately). In addition, some flashlights with this function are able to work even while the battery is charging (in fact, from the mains). At the same time, chargers of this type are not as universal as "chargers" for individual batteries (see the corresponding paragraph).

- Car memory. The presence in the kit of a device for charging a flashlight from a car cigarette lighter (or a standard auto socket of the same size). Typically, such a device has the form of a simple plug with a cable; the cable can be made detachable. And in some models, a separate car charger is completely absent: to charge the battery, the flashlight itself is inserted into the cigarette lighter socket, and the body of the device plays the role of a plug. See "Power - Cigarette Lighter" for details.

- USB cable for charging. The presence in the kit is separately only a cable for charging, but without a...complete plug into an outlet. At the same time, you have the possibility to charge, for example, from Power-bank.

- Battery charger. A device for charging the batteries supplied with the flashlight. Only models with removable batteries are equipped with such a device - in fact, the battery must be removed to charge. This may create some inconvenience. On the other hand, batteries are usually made in a standard size, which gives many additional options. For example, you can buy a spare set of batteries and use it while the main one is charging, or even put disposable batteries instead of "native" batteries; The charger can be used not only for flashlight batteries, but also for other compatible batteries.

— Power element(s). A battery is included with the flashlight. This feature allows you to use the flashlight immediately after purchase, without buying additional batteries separately. Note that the presence or absence of a battery in the kit does not depend on the type of battery itself (see "Power"): for example, models for the original battery are not always equipped with such a battery. Therefore, if readiness for work “out of the box” is critical, you should choose a flashlight for which the battery is directly declared in the kit. At the same time, it does not hurt to clarify which element the product is equipped with - a disposable battery or a rechargeable battery.

- Light filters. Removable filters, commonly used to color the beam of a flashlight in one color or another - red, blue and / or green. See "Additional Modes" for more information on such colored lighting; Here we note two points. Firstly, the set of light filters can be different: for example, red light is common, but green and blue are much less common. At the same time, for some lamps, additional light filters are produced separately, they can be purchased in addition if necessary. Secondly, if a flashlight with colored light does not have filters in the kit, it means that this model uses separate colored diodes or, much less often, built-in filters. Both the one and the other option turns out to be more convenient from the point of view that to switch colors you do not need to mess around with interchangeable accessories (which you can forget somewhere or lose). On the other hand, additional equipment somewhat complicates and increases the cost of the design of the entire device.

— Clip for carrying. The presence in the design of the flashlight of a special clip (clips) - similar to that used in portable players, ballpoint pens, etc. This clip allows you to fix the flashlight on clothing, for example, on the edge of a pocket. This function is intended primarily for ease of wearing: a flashlight fixed with a clip will always be in one place, without getting lost or confused in your pocket.

- Bicycle mount. Fastening for installation of a lantern on a handlebar of a bicycle. Allows you to use the lighting device as a source of head light and indicates the presence of a cyclist on the road at night. As a rule, the holder is fixed on the steering wheel by means of a screw clamp, and the flashlight is held in it due to the elasticity of the mount.

- Strap. The presence in the design of the lantern strap for mount on the hand. It protects the device from falling: even if you accidentally open your fingers, the strap will hold the flashlight on your hand (or at least delay the fall so that you have time to react). And in diving models (see "Type"), such a device can, on the contrary, keep the flashlight from floating up. In large-sized hand-held lamps, the strap may be designed for ease of carrying on the shoulder, but such options are quite rare.

— Case. Existence in a set of delivery of a special cover for storage and transportation of a lamp. Such a case protects the device from excessive contamination and provides some degree of protection against damage. In addition, it can come in handy for protecting surrounding fragile items - for example, if you have to transport them along with a flashlight in a tightly packed bag or backpack.

- Underbarrel mount. Attachment for mounting an underbarrel flashlight (see "Type") on a weapon. Most often, such a mount is designed for a standard Picatinny / Weaver rail, but other options are possible; This point does not hurt to clarify before buying. In any case, this equipment is convenient because the mount does not need to be looked for separately; on the other hand, it may not be suitable for non-standard "seats".

- Without mount. The absence of a mount on a weapon in the delivery set of an underbarrel flashlight (see "Type"). Such models were originally intended for use for a different purpose - usually as hand-held compact ones (see ibid.), and the possibility of installation under the barrel is provided as an option. Also, you should pay attention to this option if the weapon has a non-standard way of installing flashlights - the mount for such an installation is easiest to buy separately from the flashlight.