Type of lens and reflector
This is sometimes not a good case, but the power and type of led as well as its lens and its reflector (the silver zone) are as important as quality can improve or worsen performance.
Type of lens, There are smooth and rough, the smooth ones usually show concentric rings and a light clear and powerful, the rough have the function of blurring the light making it more smooth and even. It is evident that this is also related to the type of light (launcher or innundadora).
The lens can be flat or curved (convex), those who use the latter generally seek to open the beam and get better innundar.
The glass lens better than the plastic and in case of the reflector better one of metal than one of painted plastic.
The reflector may be more inside the flashlight or be more superficial, evidently if deeper the beam concentrates and if it is closer to the lens, the beam of light will open. The shape of the reflector also clearly affects the beam.
Then we can find models that can be coupled with colored lenses to change the color of light according to needs and lately have also created an RGB led (ie, can reproduce other colors) thus eliminating the need for extra lenses.
Type of water protection
We may or may not need a flashlight protected from water, which is not the same as submersible.
It can be read many times “water resistant”, “splash resistant”, “rain resistant”, etc. Which does not mean that it is submersible, you have to read carefully.
When we speak of submersible should also include the depth and time of immersion.
But the protection is standardized and should appear in the catalog, and its Standard DIN 60050-9 uses a nomenclature that starts with “IP” (international protection) according to the following graph.
The standard for water is the IPX (protection number)
It goes from IPX0 or unprotected. Hata IPX8 Complete and continuous immersion in water.
Some manufacturers put the resistance to fall in cm or meters.
There are models with rubber outer body (rusty), especially resistant to falls.
Flashlight body material
Usually we can find the plastic and the aluminum, although in higher ranges also the titanium.
We can then find lanterns with a varied number of “extras”, considering that many of them can impair the performance of the lantern as such.
Ultraviolet light to check the money