Guide for Purchasing Flashlights

Although mobile phones now have the function of carrying a flashlight, at night, when there is a power failure at home or when traveling, the mobile phone also has no power, so the flashlight can be of great use.

Actually required flashlight

Many people do not know their actual needs, and it is inevitable to pay for redundant functions. The purpose of this article is to let readers know their real needs and buy the flashlight that is most suitable for them with the lowest budget.

Generally speaking, when you have the idea of buying a flashlight, it means that the flashlight function of the mobile phone can no longer meet your needs. Then, compared with the flashlight function of the mobile phone, what necessary qualities should an independent flashlight have?

First, the flashlight on the mobile phone will consume a lot of power, and the independent flashlight must have a lasting life.

Second, the flashlight of the mobile phone can not shine far. The independent flashlight must be bright enough to shine far.

Third, in special scenarios, mobile phones are not convenient for work, such as in extremely cold and rainy environments. In the bacterial police patrol task, only independent flashlights can be used.

Parameters of flashlight

Rigidity parameters

This part determines the basic quality of a flashlight, including luminous flux (lumen), endurance, waterproofing, price, etc.

1. The higher the brightness, the better? Of course not, because of the marginal effect.

The marginal effect refers to that when other inputs are fixed, a certain input is continuously added, and the new output or income will gradually decrease. That is to say, when the increased input exceeds a certain level, the output of each new unit of input will decrease.

Increasing brightness is like increasing exposure. We use a flashlight to see objects. To put it bluntly, we add extra light to the environment with insufficient exposure. If too much light is added, the objects will turn white (yellow) and become more difficult to see.

Generally speaking, 200 lumens is enough for daily use. 500 lumens can fully meet the demand outdoors. If you want to be very bright, 1000 lumens will reach the top. However, to achieve the blinding effect in tactics, the higher the luminous flux, the better.

1. There is battery replacement, charging only, and replacement of rechargeable batteries. The most recommended way is to replace rechargeable batteries, one of which is not like the former, which needs to buy a lot of batteries and pollutes the environment; The second is that it is more reliable than charging only, and there is no need to worry about charging speed.

1. The waterproof grade can be divided into nonwaterproof and ipx4-8. The most recommended is ipx8 because the waterproof grade determines the workmanship and quality of the product. If you want to buy a flashlight that has been used for a long time, go to ipx8.

Select required parameters

1. Power bank function

Yes, but not necessary.

Since the flashlight has been used, it means that it must be outdoors, and there are still people who do not carry a rechargeable battery pack outdoors. A flashlight has a maximum power of 5000 mA. With the loss, it is not worthwhile to charge the mobile phone. It is better to directly use a large charging bank. The flashlight should be responsible for lighting with peace of mind.

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1. Light color

There are white light and yellow light. White light has good color rendering and yellow light has strong penetrability. If you need to take pictures, you should choose white light. Yellow light cannot be adjusted later; If it is simply used outdoors, the practicability of yellow light is better, but the actual situation is that there are almost no yellow light flashlights on the market.

wavelength × Frequency=speed of light. When the speed of light is constant, wavelength and frequency increase and decrease.

The longer the wavelength is, the lower the frequency is, and the lower the frequency is, the smaller the energy of a single photon. Because of the wavelength, the light has a strong diffraction ability (also known as diffraction), that is, the wavelength has a long propagation distance and is not easy to dissipate.

1. Portable

This is an aspect worth considering. It is mainly reflected in the size and weight of the flashlight. Under the same conditions, the smaller the item, the lighter the better.

1. Material

If you want to pursue quality, you must use aviation-grade aluminum alloy. If you want to use it casually, it is still affordable to use plastic.

1. Zoom

An ordinary nonzoom flashlight can compete with four or five thousand zoom flashlights in terms of quality. Therefore, it is not recommended to zoom in when the budget is insufficient. The zoom is easy to break due to its structure, and its waterproof performance is not as good as that of nonzoom flashlights.

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