A 'flashlight' is a portable light source that is mostly electric-powered. This handheld device is also commonly called a 'torch'. The light source can either be a light emitting diode (LED) or an incandescent bulb. LED torches are, however, a relatively new technology as compared to incandescent bulbs. Bright blue LED torches were created in 1992 in Japan for the first time. Later, white LEDs were manufactured utilising the same technology.
The light-to-power efficiency of LEDs is far higher than incandescent bulbs. LEDs are also comparatively more durable and generally have an expected lifetime of up to 100,000 hours. The typical voltage level required to operate an LED torch is between 3.0 to 3.6 volts. When using a 1.5V dry battery, a step up circuit in the LED torch is imperative.
Introductory level knowledge of LEDs and the various types and advantages is generally all that is required to help a buyer choose the best LED torches. eBay features a diverse collection of torches, both LED and incandescent, in different price ranges, or a buyer can shop in local hardware stores and discount stores to find LED torches.
Operation of LED Torches
LED torches are relatively small in size, but they have a high light producing capability. This is one of the reasons they are used in traffic lights, for promotional displays, and for many other uses. Light emitting diodes, as the name suggests, are diodes that produce light. A diode is a two-terminal electronic device that consists of one anode and one cathode that only conducts current in one direction. When electric current passes through certain types of semiconductor diodes, light is produced, and the diode is then called a light emitting diode, or LED. Electroluminescence is the term used for this phenomenon. The semiconductor material that is used determines the colour or wavelength of the light, and it can range anywhere on the infrared and ultraviolet spectrum.
Symmetry and Parts of LED Torches
Household LED torches are usually encapsulated in a parabolic epoxy case. Generally, the other parts that constitute an LED torch are a wire bond, a reflective cavity, a semiconductor die, and a lead frame that consists of an anvil and a post. The flat spot is on the cathode side. A series of batteries is often used as a power source, and a switch separates the diode from the batteries. The batteries, switch, and the whole mechanism are mostly housed in a tube. As soon as the switch is turned on, the diode receives a charge from the circuit, and current starts to flow through the LED. The reflective cavity bounces the light that is produced, which is intense, clear, and bright. Before entering the surrounding areas, the light passes through a lens that controls, among other things, the spread of light.
Choosing the Best LED Torch
Different people have different reasons to buy an LED torch. Their purpose determines whether a particular LED torch is a suitable option or not. In other words, the choice of the 'best' LED torch is directly related to what the buyer intends to do with the torch. If a buyer is seeking to replace only the bulb in a torch, the factors to be kept in mind include voltage, power, intensity, and colour. In some cases, a buyer might want a torch with more power and intensity to serve his or her needs, and this torch would be more elaborate and expensive than basic torches.
Once the need for a torch has been established, the next step is determining the available budget by setting the maximum spending limit. As a rule of thumb, the higher the price, the higher the quality of the torch, and vice versa. So a buyer should look for an LED torch that meets his or her requirements and also fits within the maximum spending limit.
The voltage at which the LED operates is a primary consideration. The total number and types of batteries determine the overall voltage level. Care should be taken when applying voltage across the terminals as applying a higher voltage than recommended for the torch brightens the torch, but it can also result in heat dissipation. This causes 'thermal runaway', a situation in which the LED torch sucks more current from the power source, and this, in turn, leads to even more heat dissipation and eventually a ruined LED.
Fitting of the LED torch bulb is another important consideration, especially when a replacement bulb is required. A fitting that is too loose or too tight is of no use. It is a good practice to look at the manufacturer's website for fitting information before attempting to purchase new fittings or bulbs.
Intensity and brightness should also be considered before choosing an LED torch. Luminosity determines how far a beam of light is thrown and is one of the best criteria for selection. The unit of measurement is 'lumens', and luminosity typically ranges between 10 and several hundred lumens, depending on the usage of the LED torch. In many cases, multiple bulbs are mounted on a single assembly to achieve maximum illumination. The total number of bulbs can be adjusted to adjust the level of brightness without altering the voltage levels. It should be kept in mind that higher brightness generally leads to reduced battery life.
Colour is another variant when it comes to selecting an LED torch. A huge variety of light colours are available to buyers, but white light is still the most preferred option because of its brightness and the ability to show the true colours of objects that are illuminated.
Ultra Violet (UV) LED Torches
In addition to the above mentioned considerations, wavelength is an additional consideration for UV or black light bulbs. Typical ranges are between 365 nm and 410 nm. The lower the rating, the higher the glow, and vice versa. More professional versions are closer to the 365 nm limit and are typically more expensive than other versions.
Tips for Buying LED Torches
When it comes to buying the right LED torch, there are some basic tips that most buyers find to be helpful. As an example, the buyer should determine the power source for the LED torch. In order to avoid excessive battery use, recharging torches may be an option for some, but not all, torches. Rechargeable LED torches save the buyer the hassle and expense of buying and replacing batteries again and again. A large variety of standard LED torches use batteries as a power source, and these torches are available at comparatively less expensive prices. Shake torches are also an excellent option if a buyer does not want a battery-powered LED torch.
The lumen rating provides information about the brightness level of an LED torch. Brightness affects the effectiveness of the torch in some cases and also the battery consumption, so this is an important factor. A buyer should also determine whether he or she needs a waterproof LED torch or an ordinary torch, a small size or a large size torch, and a lightweight or a heavyweight torch. Keeping all of the above mentioned considerations in mind enables buyers to make an informed decision about the right torch.
Buying LED Torches on eBay
LED torches of different types are readily available, and eBay boasts a sizeable collection of these torches to fulfil the needs of a diverse clientele. To begin your search for an LED torch on eBay, you can use the search bar on the eBay homepage. Simply enter a relevant query, such as 'LED torches', 'flashlight', 'torches', 'UV LED torch', et cetera, to find available options. You can shortlist the results by using the various filters on the results page.
If you are interested in picking up the item to avoid delivery charges, you can use the 'Distance' filter to enter your postcode to find sellers that are located near you. You should also contact the seller in advance to verify that he or she is comfortable with you picking up the item.
As soon as the purchase is complete, you can leave feedback for the seller in order to give future buyers more information about the seller's business practices. You should also take advantage of the feedback system yourself by reading the user comments about the seller before committing to a purchase.
Light emitting diode (LED) torches are one of the latest improvements in flashlights. Light-to-power efficiency of LEDs is a lot better than that of incandescent bulbs. Unlike incandescent bulbs, LED torches are highly durable and have an estimated lifetime of as much as 100,000 hours. Basic knowledge of the various types of LED torches and their parts is essential for a buyer who wants to choose the right torch for his or her needs.
When choosing a specific LED torch, the intended purpose of the torch is an important consideration. Other factors to consider include budget, voltage levels, bulb colour, and luminosity. Light wavelength is also important when it comes to UV LED torches. Generally, wavelengths range between 365 nm and 410 nm with lower wavelengths providing the best quality light. Many useful tips are available to help a buyer choose the right LED torch for a particular task.