Basic knowledge of flashlights

At present, the commonly used light sources for flashlights are:

Incandescent lamps, which heat the filament to a certain temperature and emit light, mainly include the following types:

Characteristics of ordinary vacuum incandescent bulbs: low cost, easy to obtain, and low light efficiency

Characteristics of filled krypton gas bulb: slightly higher cost, slightly higher light efficiency than ordinary vacuum incandescent bulbs

3. Characteristics of halogen bulbs: More commonly used, suitable for home lighting, desk lamps, etc., with a slightly higher cost than ordinary vacuum incandescent bulbs“

4. Characteristics of filled xenon light bulbs: high light efficiency, high cost, generally used for high-end flashlights;

LED: Light emitting diode, which uses semiconductors as light sources for emitting light, mainly includes the following types

According to size, it can be divided into: 3mm, 5mm, 10mm, high-power, etc

According to color, it can be divided into: red, green, blue, white, yellow, etc

According to the principle of luminescence, it can be divided into direct luminescence and the use of fluorescent materials

According to the manufacturer, it can be divided into: LS LED in the United States, Seoul series in South Korea, Cree series in South Korea, Osram series in Europe, and Japan's Nissan series

According to the luminous power, it can be divided into: small power transistor, 1w, 3w, 5w, 10w, etc

According to the core, it can be divided into: single core (such as low-power transistors produced by various factories and 1w, 3w, etc.), multi core (such as p7, mc-e, ls-5w, etc.)

According to color temperature, it can be divided into warm and cold colors

HID: High pressure gas discharge lamp, commonly used in places such as car headlights and outdoor search where volume requirements are not strict. Its classification is mainly based on power and manufacturer.

Classified by power: 10w, 20w, 35w, 60w, etc

By manufacturer: Osram, Sheraton, etc

According to color temperature, 4500k, 7000k, etc

According to the discharge form: short arc and long arc

Laser:

Classified by color: red, blue, green, yellow, purple, infrared, etc

According to power, it can be divided into: below 5mw, 5mw, 10mw, 50mw, 100mw, 150MW, 200MW, 250mw, 600mw, etc

Z Other luminescent light sources:

For example, light sources with long-term luminescent effects manufactured using fluorescent materials and trace radioactive elements