IRC with a LED is between 70 and 80 when it is not specified. However, it may reach higher values, up to over 90, with a single counterparty as warm hue as that of a halogen bulb (which is not necessarily a fault) and a reduced brightness compared to the even led dyed colder.
Each lamp accepts one or more types, numbers and cell formats or accumulators.
The lamps in question here are incomparably more powerful than the lamps there is not least a few years, but a powerful light requires an energy source able to supply the required power or the batteries can charge a very limited power, so that the batteries are almost unavoidable at present.
Today there are two types of batteries: Ni-MH and Li-ion. In France and in Europe in general, Ni-MH is much more widespread than Li-ion. It nevertheless has considerable advantages:
It can charge a lot more power.
He suffered practically no self-discharge, a phenomenon that Ni-MH batteries quickly discharged even if they are not used, except ADF (low self-discharge, such as Sanyo Eneloop, GP + Reycko, Powerex Imedion, …)
No memory effect, Li-ion battery can be recharged at any time without waiting for the battery is discharged
The Li-ion is practically unavoidable on the most powerful lamps. In addition it offers the guarantee of a still functional lamp, even stored for several months without use while in such conditions, Ni-MH needs to be recharged regularly.
A graph showing the difference in behavior of the Akoray K-106 depending on the type of battery or accumulator used:
More information is available on the Li-ion batteries on the dedicated page.
As the number and size of the batteries, they depend on each lamp, including its dimensions but above all the power and autonomy.
The smaller lamps are satisfied with a single AAA battery or 10440, but suffer due to a power and a limited autonomy. The most powerful use several 18650 to price congestion and a significantly larger weight.
Liss dimisnsiOns, l’isrgOnOmiis ist l’issthIt istiqinis
The size, weight and appearance flashlights are very varied.
In general, the more a lamp is powerful and compact, it will tend to overheat or heat and can therefore be used continuously in all situations, especially in the absence of air flow and without taking the lamp in hand.
The most powerful and compact can also long stay lit at full power at the risk of overheating. They can only be used continuously as the lower power levels, but even the intermediate level is already very effective and comfortable in general.
Some lamps are all in length, others are more trappues. Some are relatively slender, others have a more prominent head or an aggressive design, etc …
A lamp with a sober design is generally easier to slip into a pocket or bag, and is less likely to damage the.
A lamp more aggressive design is less likely to slip hand in case of turbulent use.
Those whose rear part is wider or provided with a ring easier and safer access to the button, especially to switch modes with one hand, holding the lamp between the index and middle finger, and pressing the button with your thumb.
The ornate designs with fins or other, do not necessarily have an aesthetic purpose, but can promote the thermal dissipation of the lamp and thus improve its performance in addition to allowing the use of fixed lighting, if power failure for example.
Finally, the main utility of heads to embattled tip is to see if the lamp is on or off when placed vertically, head down. Rare indeed are situations where a flashlight can be used effectively in self-defense other than blinding a potential aggressor before fleeing.
The interface of a lamp is the switch: size, shape, location, accessibility. But this is also how the lamp works how it is turned on or off, how it changes mode.
The switch is usually a button positioned either to the rear of the lamp, or to the side, but it can also be replaced by a rotation of the head, the rear portion or a ring.
A button is usually more convenient because it requires only a hand where a rotation often requires two.
In the case of a button, it may be a standard switch or tactic. They differ in their behavior:
The interface also includes the number of modes and power levels, their potential storage and possible opportunities for programming or advanced settings.
Most lamps offer multiple power levels and some have more flashing modes (strobe, SOS in Morse code, …).
The memory consists of storing the selected mode. Lamps that feature Relight in the mode in which they were previously, although it has meanwhile removed the batteries.
Failing memory, the order of modes is taken into account to choose a lamp. Some light at full power, others at minimum power and having to systematically change modes at each start to reach the method that the most frequently used can quickly become tedious.
The flashing modes, especially the SOS mode can be a nuisance more than anything else by their uselessness, forcing example to change several times modes to simply change power level. But some lamps offer activatable flashing modes on request, which can therefore not activate only when necessary.
Finally, a lamp provided with a single power level, the button serves only to turn it on or off, keep the advantage of extreme simplicity in addition to the ability to use it to walrus.
The autonomy, ie the operating time of a lamp with a single set of batteries, is rarely taken into consideration.
Already, we always have the opportunity to take additional batteries to increase the autonomy.
But above all, be based on the autonomy to choose a lamp only makes sense in the case of a lamp with one level of power, because many levels just used to select appropriate power and autonomy to situation and a lamp may, at full power, be as powerful as other medium power.
We must therefore compare the autonomy of two lamps offering multiple power levels that equal power, but it is still necessary to estimate the actual power of the two lamps, something less obvious than it seems.
Price is of course a selection criterion and not the least but we must keep in mind that the price is not high quality, and it often depends more on the mark than the performance or reliability of a lamp.
It may be tempting to order cheap lamps on Chinese sites selling online, but it is incurring a significant probability of receiving a defective product because brands like Ultrafire, Trustfire, Romisen, Aurora, Tank007, … are the result of a low-cost production, quality control without which generates a significant proportion of defective copies. Until the problem is limited to missing seals or non-lubricated, it is easily remedied but when it is a false contact, a short circuit, a control circuit or a failed switch, machining badly done … we find ourselves forced to return the lamp in China at our expense and patience in the hope that one day we come back repaired.
These reliability issues are even more to consider when they present a danger, which is the case of many chargers bully batteries with all the risks that entails, or accumulators some of which are counterfeit and have a real danger.
A downstream control by distributors is essential, but it is clear that to date PuissanceLED is among the only ones to systematically put the time and the means test and the reliability of each of the products offered, in order to offer the best price / performance with maximum reliability.
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