Modern civilization should indeed thank the American inventor Thomas Edison, who made the first white lamp with commercial value and brought light to mankind. However, Conrad Hubert deserves the same respect.

The development of mobile lighting tools can be traced back to the early stage of the development of human society-primitive society. Since humans learned to drill wood for fire, mobile lighting has experienced a development process from fire, oil, candles to flashlights.

Flashlight prototype Edison invented the light bulb, Volt invented the battery, invented the real flashlight. However, the light-emitting performance of the bulb is very unstable, sometimes bright and dark, hence the name "Flashlight". It was not until the late 1960s that the "lighting function" ......

1. High energy saving Energy-saving energy without pollution is environmental protection. DC drive, ultra-low power consumption (0.03-0.06 watts per tube) electro-optical power conversion is close to 100%, the same lighting effect is more than 80% energy-saving than traditional light sources.......

1. The number of heads is moderate. Generally, no more than 12 heads should be used for household use. It is better to use 2 to 3 batteries. If it is too large, it is a bit wasteful. You can determine what you need for other special needs. 2. The welding must be firm. Each diode is connected to t......

Look at the aperture, the aperture of a good LED flashlight is a uniform circle, and the light spot of a poor LED flashlight is divided into yellow and blue unevenly distributed.