I’ll tell you about an easy-to-make underwater flashlight with a built-in battery for powering. This lantern has the ability to float on its own with the holder up and at the same time shine down, illuminating your ascent from the depths.
To make this flashlight you will spend very little money (about 600 rubles) on the battery, housing, halogen lamp and wires.
First, I buy an uninterruptible battery from a technical store. In my case it is Sven 12V, 7 Ah, dimensions 90x65x150. The manufacturer is not important, we are only interested in the dimensions.
For the body I use a pipe coupling purchased at a plumbing store with a diameter of 110 mm and a length of 150 (standard). Our battery fits tightly here. There I also take a plastic plug for the same pipes and an adapter from 110 to 50 mm.
Since the length of the battery and the coupling are almost the same, I am slightly improving it to accommodate the plug, as well as the adapter. 
A halogen soffit (display light) with a diameter of 50 mm fits perfectly into the adapter tube - it immediately serves as protection to enhance the direction of the light flux.
For the holder I used a regular wooden door handle (this is desirable). The wooden handle provides much-needed positive buoyancy, which helps our lantern float freely, illuminating the bottom. The handle gives it stability and at the same time helps to shine down at the angle we need.
Our spearfishing flashlight sinks a little, and to eliminate this by making the correct balancing, we glue a 2.5 cm thick foam plastic circle onto the plug (the size was determined experimentally).
Next, I glued the parts of the lamp together with silicone sealant and sealed the outside of the cracks along the lamp. I bend the handle of the flashlight to create a small angle.
Now it is comfortable to hold, the handle is in a strictly horizontal position and the flashlight “looks” a little down. This prevents the observer from “spotting” me from the shore + it’s convenient to work with (I float up along the flashlight’s beam). I attached the handle with electrical tape (you can think of it differently).
I didn’t try to be clever when I came up with a switching system, but simply bridged the two wires that come out of the case with the wire for charging the battery.
The weight of the small invention is almost not noticeable under water, so the hand does not get tired during many hours of hunting.
In the end, it turned out very not bad a homemade flashlight for spearfishing, although the switching system will still need to be modified. =)
Good luck with your underwater voyages!
Today we will learn how to make a homemade flashlight for spearfishing. The main trend of underwater lights is that they come with batteries.
According to statistics, today the most popular flashlights for underwater hunting are two types of flashlights: the MagicShine flashlight and the Ferei 152. The flashlights are made of metal and have several glow modes (100% light, 50% light, 25% and strobe mode).
Spearfishing flashlights vary in filter type . Many lanterns are sold with cold light (white - more suitable for seas and oceans, for water that has greater transparency) and warm light (yellow - suitable for rivers, muddy water).
There is a flashlight for underwater hunting with a red glow. When purchasing a flashlight, pay attention to the halo of glow; it may be denser or have a central point of light.
It is recommended to make a homemade flashlight for spearfishing after carefully studying its features.
Lantern sizes range from small to large. Small flashlights have a compartment for one battery, so they will shine very weakly (about 2 times less), they are well suited for a gun with an offset handle. Various filters are used to change the color of light.
Flashlights are usually divided into two types: for beginners and professionals ( high power). The difference between these types is the number of diodes. Flashlights with one diode do not exceed 1000 in power. A professional flashlight for spearfishing has several diodes (for example, 3).
A homemade flashlight for spearfishing can be an amateur one, since you can create with my own hands professional is very difficult.
You can increase the amount of work in medium mode (2.5 hours) using several batteries connected together (two blocks of two batteries are connected by wires in parallel). The sum of four batteries is about 14 amps. This device must be under close supervision at all times.
A regular (native) battery, due to the fact that the controller limits the discharge and maximum charge to full capacity, loses 5 percent of its full charge. At the stage of assembling 4 batteries with a controller, 10% of the full charge will be lost if the controller is not removed. Subsequently, the battery is fully charged. In terms of time, this takes twice as long as charging a regular battery (since we have not two, but four batteries). The operation of such a battery will be no less than 6 and no more than 8 hours (after approximately the 5th charge cycle, the exact time can be determined).
Because The resulting battery will not fit completely into the flashlight; you need to measure the size from the cover (from the pressure valve) for a specially machined insert (removable addition). You can make a homemade flashlight for spearfishing, but to do this you need to know the features and nuances of its operation.
So, what you need to remember when choosing a flashlight:
- It should be as waterproof as possible;
- Consume less energy (longer work duration);
- Look at the light power (should be high);
- Durable, reliable design, protecting against breakages and cracks;
- The kit must include reliable batteries;
- Ease of use and strong hold.
All lights are attached differently. For example, there are flashlights that are fixed on the hand, on the belt, and under the barrel. When choosing, also check the cord on which the flashlight will be held. If you have a question about attaching a flashlight to, here is one way to do it.
What you will need:
Styrofoam;
;
sandpaper of different grain sizes;
rod mandrel;
spray paint.
The first thing you need to do is make a foam blank. From the previously prepared piece, cut out a rectangle 55 mm thick, 70 mm high, 550 mm long.
On our resulting part we draw semicircles on both sides (where the thickness was measured).
Next, wrap the rod in sandpaper max. rigidity and three on both sides of the foam approaching our marks. Give the shape you want using the second sandpaper(try it on the gun). We paint the resulting float with short sprays from a distance of 50 mm. We attach the lantern. Ready! Have a good hunting.
Homemade flashlight for spearfishing video
Nowadays, it is an expensive pleasure to buy a branded underwater flashlight. Therefore, I will tell you how do homemade lantern divider.
We will need: 12V – 7A battery, a simple flashlight, 20W halogen and thermal glue. A 20W halogen consumes 2A per hour. This means the battery will last for 3.5 hours, but in practice you will see the opposite is 2 – 2.5 hours.
Depending on the power and energy consumption, a diode of 600 - 700 lumens is suitable for us - also here the price is within the normal range. In practice, 600 lumens are equivalent to 35W.
But even here, not everything is so smooth. There are problems in using diode light:
1) All light diodes need a lens - a calimator. Their glow angle is 120 degrees. Need a hub.
2) The diode needs a special circuit - a driver. There are two types:
Simple - holds D.C. on the diode, regardless of the supply voltage.
Pulsed – powers the diode with pulsed current. The flickering of light occurs at a high frequency, invisible to the eye.
3) The light diode heats up like crazy. Temperatures above 120 degrees for an LED are certain death. The LED requires a heatsink.
And here is our happiness. True, the dimensions are large)))
We connect the light diode and check its functionality.
And we get that when the voltage on the battery drops, the brightness drops.
For comparison, I found pictures on the Internet:
Usually the diode crystals are filled with something transparent. Therefore, the diode does not need to be sealed. The diode crystals are filled with something transparent. Therefore, as usual, I decided not to seal the lantern. But you still need a radiator. I would recommend buying a cooler for computer power supplies.
Here is a radiator for a personal computer power supply cooler:
Here's a cheap flashlight bought in a store:
To be honest, when choosing between a lens and a reflector on a flashlight, I didn’t feel the difference. Both of these collectors are equal and do not differ much.
And so. As a result, we got a flashlight with a power of 700 lumes. Comparing with flashlights for underwater hunting, we get 1100 rubles. versus branded 5000 rub. -8000 rub.
Those. It's not all that complicated.
To use our flashlight underwater, you will have to sort out: rear, rubber protection (it is advisable to fill super glue), then fill all free electrical contacts with hot glue. It’s even better to seal all threads with rubber pads.
I go diving. I decided to take this (homemade) one instead of the club flashlight. At a depth of more than 3 m (5 -6) the flashlight worked perfectly.
Now all you have to do is use your imagination and come up with a mount for the Underwater Gun. And in the end we got a good device for monitoring underwater world in dark times and deep places, make a flashlight for spearfishing I could have the desire and time.
Every hunter knows for sure that the better the equipment, the better the hunting result. When plunging into water, which is most often muddy, the hunter must have a flashlight with him, the light of which can penetrate the water column. There are many factors that make hunting underwater difficult, such as algae and night time. However, not everyone, especially beginners, can afford to purchase expensive equipment. But you can make a lantern with your own hands.
What types of underwater lights are there?
First, let's look at what kind of spearfishing flashlights there are. They are divided into several types: rechargeable, on batteries that are not rechargeable (plus - they work longer than rechargeable ones, minus - as the light is discharged, the light will dim), xenon, LED and halogen. An underwater flashlight for spearfishing must have the following qualities - be waterproof (which is the most important factor), have a durable body and design (there is increased pressure under water, so the body must be either metal or impact-resistant plastic), and of course , be ergonomic (it is very important in poor visibility conditions to rely entirely on sensations - for this the flashlight must fit comfortably in the palm of your hand).
DIY lantern
How can you make an underwater lantern with your own hands? In principle, it is not so difficult, even more - it is interesting and exciting. We are talking about a simple flashlight powered by a built-in battery. The peculiarity of our model will be that it will be able to float on its own, without support, with the handle up. In this case, the light of the flashlight will be directed downwards, which will allow you to clearly see everything that is happening around the hunter. So, first let's decide what we need for work. For homemade products you need: an uninterruptible battery ( important role dimensions play - 90x65x150), coupling for pipes with a length of 150 mm and a diameter of 110 mm, a plastic plug, an adapter (from 110 to 50 mm), a halogen spotlight with a diameter of 50 mm, a wooden door handle, foam plastic, silicone sealant.
Let's start tinkering
The first step is to improve the coupling a little - the battery is almost the same size as it, you need to carefully place it there. The soffit must be inserted into the adapter tube. To prevent an underwater flashlight for spearfishing from sinking, a circle of foam plastic must be glued to the plug - it is important to strictly maintain a thickness of 2.5 cm. The prepared parts of the flashlight must be glued together to prevent water from getting inside; you should use silicone sealant, covering the cracks from the inside with it. The handle, which must be wooden in order for the homemade underwater lantern to float well, is attached using electrical tape (fastening options may be different). Wires need to be removed from the housing, which will replace the switching system by simply shorting it.
What are the advantages of this model
Underwater lights made this way have many advantages. The main thing is its light weight, which prevents your hands from getting tired after prolonged use. The second obvious benefit is the low cost of all purchased parts. The horizontal position of the handle also plays a positive role - the lantern seems to be looking slightly down, directing the light at an angle to the bottom, making it almost impossible to notice from the shore. Again, there is no inclusion system, which can fail at any, most undesirable moment. All parts are easily replaceable and can be found in any technical store. The service life of such an underwater flashlight is quite long - if you protect it from accidental impacts and falls, such a flashlight will serve faithfully for quite a long time.
LED flashlight
Underwater lights are not only battery-powered, as mentioned above. The LED model is good because it consumes a fairly small amount of energy and also has a high brightness. Making such a lantern is also not very difficult. To operate you will need a matrix consisting of eighteen ultra-bright LEDs, a controller, 4 Ni-Mh batteries, an EK-Light 18 module. From the sheet of stainless steel the body is made, and from the blank - the front part and nuts, which will then be used to secure the glass. Plexiglas, eight millimeters thick, is first seated on the sealant, and then additionally tightened with nuts. You can also make it yourself - draw a layout on paper, then transfer it to an aluminum plate. Holes are drilled in the designated places (250 LEDs are needed - 10 groups of 25 pieces). The reed switch and power field switch replace the power button; a battery is used for power, the charge of which lasts for seven hours. The underwater flashlight for hunting is ready.
What else do you need to know?
So, we know how to make an underwater lantern. What else should you know about them? You must completely discharge it before putting it back on charge. An under-discharged underwater hunting flashlight will lose its energy capacity if not recharged correctly. The exception is lithium batteries, but they are very expensive. If you are going far from civilization, it is worth stocking up on an adapter through which you can connect the flashlight to the car’s cigarette lighter. Will last the longest LED flashlight- it does not generate as much heat as halogen or xenon ones. Batteries made of cadmium and nickel are considered excellent in their characteristics - they are distinguished by a long charging and discharging cycle.
What other qualities are important for underwater lights?
In addition to all of the above, underwater lights must have several more mandatory qualities. They must have a reliable fastening that will not fail if a serious battle with the caught fish takes place underwater. The “crab” type mount is best suited - it has been repeatedly tested not only in spearfishing, but also in other types of hobbies.
The type of light emitters must be of high quality, and the power of the light flux, selected individually for each hunter, must be sufficiently productive. The cold light of the LEDs will give more brightness, and the warm shade will help you better see the contours of objects. Much attention you need to pay attention to optics - blurred glass will not give the desired result. So, when creating an underwater flashlight, you should take every stage seriously - a small mistake or inaccuracy can affect the entire operation of the flashlight as a whole. You can also once again focus on the cost - a flashlight bought in a store will cost at least seven thousand. Whereas a lantern made by yourself will require at least seven times less cost. It's hard to argue that with quality equipment spearfishing will only be a joy, and your favorite pastime will bring you even a single big victory in underwater battles.
UNDERWATER FLASHLIGHT “BD 22”
This flashlight was made a long time ago, so the photo shows a somewhat faded body of the flashlight and slightly frayed rubber bands. This lantern was repeated more than once by our “like-minded people,” and then one day, when I realized that I had already tried to explain its production every time, I decided to collect old photos and take new ones, write a couple of lines about its production and stupidly send out this document.
BD-22 is just an abbreviation - (dural baguette with a diameter of 22 mm). Everyone remembers the baguette that hung with us long ago during the union or that is still hanging with our grandmothers, so we will cut it into several lanterns, for 1-2-3...... batteries, depending on the properties of the driver and operation.
Let's prepare the nuts from the corresponding "SR" connector, having previously machined the glass in them, contact washers, a washer for the diode, and made a driver with a magnetic switch (reed switch, hall sensor), having previously embodied all this on paper.
Having assessed our requirements, it was decided to use a 5-watt cree and two 18650 batteries.
The baguette itself is a welded pipe in which you need to remove the internal seam with a round file, then I went through the inside with a mechanical reamer (although this is not necessary), and cut two threads with a diameter of 22, a pitch of 1 mm. and then asked the turner to make the simplest parts for the lantern. The most difficult parts are the union nuts, which I took ready-made from the ShR connector. He took the collimator out of the holder and slightly removed its skirt with netfil. I assembled a driver with a magnetic switch, glued a magnet onto a cut nylon tube and heat-shrink it (a black ring put on the body) this is the switch itself - which works either by turning this ring or moving it with your thumb (depending on who). The LED itself is mounted on a pressed-in washer (bushing), which was pressed in by lubricating the tube with thermal paste (the diameter of the washer for the LED is 0.1 mm larger than the inner diameter of the tube). Thrust sleeve for driver made of brass 0.3 mm. The driver was made from an inexpensive microcircuit (there was no other choice at that time), the rest of the driver parts were taken from old computer boards (except for the reed switch). Rubber for the rings - soft 2.5 mm (for vacuum) - cut out with suitable tubes, LED (later replaced by XP-G).
TTX:
WATERPROOF
POWER 5 WAT
GLOW TIME AT LEAST 5 HOURS (with good batteries)
MAGNETIC INCLUSION
POWER LITHIUM 2*18650
GLOW TEMPERATURE - BY SELECTION OF LED
GLOW ANGLE - BY CHOICE OF COLLIMATOR (with different angles)
BRIGHTNESS (based on LED documentation) 480 LUMENS
I also want to add there are current models Available with 1, 2, 3, 4 batteries with corresponding driver modifications.
Unfortunately, I don’t remember the number of the connector from which the nut was removed, but it can be found in the documentation for the ShR connector.
So we remove the curtains from grandma’s kitchen and the front ones.
If you have a question about assembly or electronics, it’s always yours. 
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