We recommend a night to ride a flashlight, riding at night, it is best to have high brightness LED flashlight, the longer the better the battery life
There are 2 options for the selection of flashlights: incandescent bulb and high power LED, both of which have their advantages and disadvantages. Incandescent lamp life is short low luminous efficiency, brightness under the same power as LED or the same brightness more electricity, but the advantage of incandescent lamp is LED than incandescent lamp, continuous spectrum and good color, can clearly distinguish the object and color without distortion. And bulb prices are very cheap and easy to add. LED has grown rapidly in recent years because of its long life, high light efficiency and power saving. The disadvantage is not full spectrum color is not good, the price is more expensive, and more delicate, need to be driven by constant current circuit. Here you can choose the United States Cree company's high-power LED, its LED in accordance with the light efficiency division level, and now the mainstream of Q5, R2, R5 these grades. In 1A current, Q5 can reach 250 lumen luminous flux, and R5 more than 300 lumens, the power is about 3W, with 2600mAH 18650 battery life is close to 3 hours.
For you this night ride, the best choice is to use 18650 Li battery flashlight products. 18650 is an industrial semi-finished electrical core, a wide range of applications, including laptop batteries, batteries are 18650. 18 is the battery diameter, and 650 means the battery length is 65 millimeters. The volume ratio of AA5 batteries in general slightly larger, power is generally 2000mAh to 2600mAH, similar to AA Ni MH battery, but because the voltage is 3.7V is 3 times of Ni MH battery, so the energy storage battery is almost AA 3 times on the torch in the battery capacity and volume is the best balance. If the volume requirements are relatively high, you can choose to use 1 section 18650 flashlight, if you can accept a longer size, you can choose 2 section 18650 flashlight.
For high brightness and long life, the battery capacity is as large as possible, but it is limited by size and portability.
Brightness and endurance time are a pair of contradictions, the inverse relationship between the two. So take a balance between the two.
