1, Overview of the wattage of old-fashioned street lamps
The wattage of old-fashioned street lamps varies depending on the era, region, and application scenario. In the era of gas lamps, due to limited lighting efficiency, the wattage of street lamps was generally low, mainly using the light generated by gas combustion for illumination. After entering the electrical era, incandescent lamps and high-pressure sodium lamps gradually replaced gas lamps, and the wattage of street lamps also increased to meet the growing lighting needs of cities.
Gas lamp era: From the late 19th century to the early 20th century, gas lamps were the main way of urban lighting. The brightness of a gas lamp is mainly determined by the gas flow rate and wick design, rather than the traditional "wattage". But if measured by modern lighting standards, the lighting effect of gas lamps is roughly equivalent to several watts to tens of watts of incandescent lamps.
The era of incandescent lamps: In the early to mid-20th century, with the popularization of electricity, incandescent lamps gradually became the new favorite of urban lighting. The wattage range of incandescent lamps is quite wide, ranging from a few watts to several hundred watts. In urban streetlights, the common incandescent bulbs have a wattage of between 50W and 200W, which is sufficient to illuminate the street and provide safety protection for pedestrians at night.
The era of high-pressure sodium lamps: In the mid to late 20th century, high-pressure sodium lamps gradually replaced incandescent lamps with their high efficiency and energy-saving characteristics, becoming the mainstream of urban street lights. The wattage of high-pressure sodium lamps is usually between 70W and 400W, capable of emitting strong yellow light, with a wide illumination range and strong penetration, making them very suitable for lighting on urban main roads and highways.
2, The technological evolution of the wattage of old-fashioned street lamps
The change in wattage of old-fashioned street lamps is a direct reflection of the advancement of lighting technology. From gas lamps to incandescent lamps, and then to high-pressure sodium lamps, every technological innovation has brought about an improvement in lighting efficiency and a reduction in energy consumption.
Limitations of gas lamp technology: Gas lamps rely on gas combustion to produce light, with extremely low lighting efficiency and potential safety hazards. Therefore, although the wattage (or gas flow rate) of gas lamps can be adjusted to increase brightness, their lighting effect is always limited and cannot meet the lighting needs of modern cities.
The popularization of incandescent bulb technology: The invention of incandescent bulbs marks the arrival of the era of electrical lighting. Incandescent lamps produce light by heating the filament with current, and their lighting efficiency is much higher than that of gas lamps. With the continuous advancement of technology, the wattage and brightness of incandescent lamps have been significantly improved, making them an ideal choice for urban street lights.
The innovation of high-pressure sodium lamp technology: The emergence of high-pressure sodium lamps has further promoted the development of urban lighting technology. High pressure sodium lamps use arc discharge to excite sodium vapor to emit light, producing strong yellow light with high illumination efficiency and low energy consumption. Compared with traditional incandescent lamps, high-pressure sodium lamps can provide higher illumination brightness and longer illumination distance at the same wattage.
3, The relationship between the wattage and lighting effect of old-fashioned street lamps
The wattage of old-fashioned street lamps not only determines their lighting brightness, but also affects the lighting effect and energy consumption. Under the same wattage, different types of street lamps may have varying lighting effects due to differences in light source characteristics, lamp design, and installation methods.
Soft lighting of gas lamps: The light emitted by gas lamps is soft and warm, but the lighting range is limited and suitable for narrow streets or alleys. Due to its low lighting efficiency, gas lamps are gradually being phased out in urban lighting.
The wide application of incandescent lamps: incandescent lamps have a wide illumination range and high illumination brightness, suitable for various urban lighting scenes. However, incandescent bulbs have high energy consumption and contain a lot of infrared and ultraviolet rays in their light, which have a certain impact on the human body and the environment.
High efficiency lighting of high-pressure sodium lamps: High pressure sodium lamps have become the mainstream of urban street lights due to their high efficiency and energy-saving characteristics. The yellow light emitted by high-pressure sodium lamps has strong penetrating power, which can illuminate a long distance and has a uniform lighting effect. In addition, the energy consumption of high-pressure sodium lamps is much lower than that of incandescent lamps, which meets the requirements of modern urban green lighting.
