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Q： |
Flashlight in the end condenser or floodlight? |
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A： |
Many consumers often do not know how to choose, in fact, very simple, each product has its advantages and disadvantages, must first select the type needed. There is no absolute good or bad, is relative. |
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Q： |
How do I choose a condenser flashlight and floodlight flashlight? |
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A： |
Flashlight condenser light-emitting body irradiation light more concentrated, a small central spot, a small radiation angle, per unit area according to high, so the long-range effect. Pan just the uniform spread of light, the irradiated area, the central spot, a certain distance illumination.
Concentrating long-range determined by the following factors:
Reflector, under the same light, the reflective cup diameter and depth of the proportion of the concentrating effect of the design of the reflective curve is the main reason. The diameter of the optical glass, the deeper the light cup more likely it is to design the condenser of the reflection curve, so to achieve the long-range effect, you need the flashlight head can only be achieved, and a small flashlight is unable to achieve the long-range Mirror reflector cup handle (Glossy cup) reflection efficiency, bright central spot around the aperture brightness is very low, there will be a little halo effect. In contrast, the light of the reflector cup of the orange peel surface multiple refraction of light in the uneven reflective cup reflected the center spot is not as good as the smooth reflector cup is less prominent.
Luminous body, most of the current LED flashlight with CREE company of various types of LED, LED packaging structure, the viewing angle is also different, such as the XP-G (493LM@1.5A R5) The XM-L (742LM @ 2Asuch as T6), LED luminous efficiency, but the perspective 125 degrees, a floodlight LED only be achieved if the condenser needs to adjust using a large optical glass. The core of the core of the XP-G than the XM-L under the same conditions for comparison, the XP-G concentrator better than the XM-L LED, but the brightness is difficult to achieve as high as the XM-L. CREE LED model, the XR-E (286LM @ 1A, such as everywhere the Q5) has been eliminated, and high luminous efficiency, ultra-small core of XP-E (291LM @ 1A, R2, R3) is a poly light long-range flashlight of choice, but because of the XP-E LED current drive is not too much, so the total luminous flux can not be compared with the XP-G and the XM-L.
Brightness, brightness are talking about here is a total luminous flux of the luminous body. LED flashlight most of the control circuit, the same level of LED drive current increases, the higher the brightness, which is the luminous flux (lumens, LM) greater But not the luminous flux, the stronger the greater the long-range! The flashlight of the same luminous flux, if the design of the reflector cup, the long-range effect will be different, the illumination of the center of the spot can be observed by the naked eye is not the same, and consumers tend to look at the condenser type of flashlight is brighter. If it is the same reflective curve, the greater luminous flux, illuminance certainly is the strongest, long-range also the best.
Color temperature, the present LED is broadly divided into three color temperature in cool white, white, warm white, cool white color temperature maximum, the color is not good. The warm white color temperature minimum, the color is better than cool white, used in long-range type flashlight, LED flashlight, the better the color rendering of the energy in the environment of the outdoors, rain and fog, dust reflects the penetrating, so low color temperature LED is better in the long distance to see the objects.
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