The difference between high pressure sodium lamp and low pressure sodium lamp

The basic principle of 1. high pressure sodium lamp and low pressure sodium lamp

High-pressure sodium lamp is to charge sodium and high-pressure mercury vapor in a spherical gas discharge bulb and heat it to emit yellow (spectral lines are mainly in the yellow and green regions, most of which are concentrated in the yellow region). The low-pressure sodium lamp is heated by charging sodium and neon in a long tubular discharge bulb to make it emit orange-yellow light (the main spectral line is in the orange light region).

2. brightness difference between high pressure sodium lamp and low pressure sodium lamp

The brightness of the high-pressure sodium lamp is greater than that of the low-pressure sodium lamp, because the luminous intensity of the high-pressure sodium lamp is higher. High-pressure sodium lamps emit more light and have a higher color temperature than low-pressure sodium lamps. The higher the color temperature, the closer the light color is to white. Therefore, in terms of outdoor lighting, high-pressure sodium lamps are more suitable for lighting purposes than low-pressure sodium lamps.

Life difference between 3. high pressure sodium lamp and low pressure sodium lamp

High-pressure sodium lamps have a longer life than low-pressure sodium lamps. The long life of the high-pressure sodium lamp is mainly due to its low filament temperature and low steam pressure, so the life is longer. In actual use, the life of high-pressure sodium lamps is usually between 15000 and 20000 hours, while low-pressure sodium lamps are only 8000 to 10000 hours.

4. the price difference between high pressure sodium lamp and low pressure sodium lamp

The price of high-pressure sodium lamps is usually higher than that of low-pressure sodium lamps, but with the development of technology and the increase of use, the price difference is getting smaller and smaller. In some cases, high-pressure sodium lamps are even cheaper than low-pressure sodium lamps.

In summary, there are certain differences between high-pressure sodium lamps and low-pressure sodium lamps in terms of brightness, life, and price. In practical applications, we need to select the corresponding sodium lamp according to specific needs to achieve the best lighting effect.