From the CREE LED just defeated lumens, the flashlight player's vision from the incandescent transfer to the LED above, has been for many years. LED in daily life has been very popular, it is because the Beijing 2008 Olympic Games a lot of procurement CREE LED, so that CREE know the power of the Chinese market. That is the beginning of the CREE Chinese official website opened, and began to promote their products in a large area of ​​China.

But in the popularity of LED technology today, the vast majority of ordinary people do not understand the pros and cons of LED. Led to a lot of ALICE use large powder group LED flashlight, and even a large number of long straw hat in service. A lot of know that there is a better flashlight, intended to buy, but looking at Taobao strange all kinds of flashlight at a loss Altar system flashlight purchase guide is also a little old, and now is not fully applicable now. So this article combines the latest information, talk about flashlight-related knowledge.

In the formal start before talking about some flashlight and LED professional terms to explain. We can also ask questions can be raised. I will take time to answer!

Luminous flux: the total brightness emitted by the luminous body. Unit lumens lm, professional points to accurately measure the ball.

Light intensity: Total luminous flux per unit area. Unit lux, illuminance meter can be accurately measured.

Light efficiency: luminous efficiency, 1W power luminous body luminous flux. Unit lumens per watt lmw.

VF value: simply is the current current LED operating voltage.

SureFire: the real beauty of the United States, do not be Taobao what SupFire, UltraFire cottage gods flicker.

Spotlight: the pursuit of flashlight projection distance, LED light angle is smaller, the greater the cup size, the better the condenser performance.

Floodlight: floodlight just and condenser on the contrary, the pursuit of the irradiation area. Requires large angle LEDs and small cups.

CREE LED also has a lot of series and models, I simply talk about them often used several. (What MCE, P7, SST50 we do not read the old product, and efficiency is not)

XRE Q5-WC, XPG R5-1A, XML T6-1B

The above is several common CREE LED.

Q5, R5, T6 refer to LED rating.

XRE grades are P3 P4 Q2 Q3 Q4 Q5 R2

XPG grades are R3 R4 R5 S2 S3

The level of XML is T4 T5 T6 U2 U3

The higher the level, the higher the luminous efficiency. 2 levels between the brightness difference of about 7%, the naked eye is unable to accurately distinguish.

XRE, XPG, XML refers to the LED package.

In addition to these, there have been flashlight XRC, XPE, XPC, MCE and so on. The same as the package on behalf of the same shape. XRE light angle is the smallest, suitable for long-range flashlight. XPG luminous core area and angle than XRE larger, XML luminescence core and angle is the largest. These two kinds of flashlight-type flashlight made on the cup size requirements than XRE big, but the floodlight better. The actual use of flashlight is mainly by flood lighting.

Generally not a senior flashlight enthusiasts, watching the flashlight is bright, just look at the brightness of the center of the flashlight. In fact the brightness of the central spot can only reflect the light intensity of the flashlight, and can not explain the overall luminous flux. Is not the higher the light the higher the luminous flux! Only the smaller the angle of the LED light, the greater the size of the cup so the better the light, the intensity must be high. So it is possible that a large caliber cup of the XRE Q5's flashlight center light spot brightness than the small caliber cup of the XML T6 flashlight looks brighter. But if the night can be used to find a great difference, XML flashlight area and brightness and much better!