Different Types of led street light bulbs

The lighting on streets is an essential element of urban infrastructure that enhances the safety of roads, visibility, and security in the night. As there have been improvements in the field of lighting, there have been various kinds of street light bulbs that have been employed over the decades at varying degrees of efficiency, brightness, and life span.

In the modern world, cities and infrastructure developers have the option to go with the outdated technology of lighting, or newer energy-efficient technology. This guide will detail the various forms of the street light bulbs, the pros and cons, and their optimal use, giving you an idea of what type of lighting solution can be used at the road, highway, park, and other public places.

1. LED Street Light Bulbs

In the contemporary street lights, the most popular technology that is being employed is the LED (Light Emitting Diode) bulbs. They have quickly replaced the outdated lighting systems due to their efficiency in energy, long life and high performance.

LED street lights offer white light that is bright and evenly distributed with high visibility. Since the LEDs use very little electricity and minimal maintenance, they are much cheaper to maintain compared to the conventional bulbs. The use of LED street lights is being adopted by many cities globally to lower the cost of operation and carbon emissions.

Key Features

• Lifespan: 50,000–100,000 hours
• High energy efficiency
• Zero warm up time, real time startup.
• Better visibility by good colour rendering.

Advantages

• As much as 80% of energy saving over conventional lighting.
• Lower maintenance costs
• No mercury (environmentally friendly).
• Smart lighting systems are compatible.

Disadvantages

• Emailing is more expensive to start with.
• In extreme heat conditions, performance can be reduced.

Best Applications

• Urban streets
• Highways and expressways
• Parking lots
• The initiatives of smart city lighting.

Due to their efficiency and longevity, LED lights are said to be the future of street lights technology.

2. High-pressure sodium (HPS) Bulbs.

The technology of high-pressure sodium lamps was once the prevailing technology in light illumination of the streets across the world. They generate the well-known yellow-orange light that is common on highways and factory roads.

The HPS lamps are relatively energy saving and they have long life span as compared to previous lighting technologies. Their main disadvantage however is poor color rendering, i.e. objects under the light are distorted or monochromatic objects.

Key Features

• Lifespan: about 24,000 hours
• Efficiency: 70–150 lumens per watt
• Unique yellow-orange light.

Advantages

• Lower upfront cost
• Dependable performance in extreme weather.
• Good vision even in fog or rainy weather.

Disadvantages

• Inadequate index of color rendering (CRI)
• The deterioration of brightness with time.
• Less energy saving than LED.

Best Applications

• Highways and major roads
• Bridges and tunnels
• Industrial zones

Despite the fact that HPS lights are still being applied in certain areas, most cities are slowly shifting to LED lighting systems in the street.

3. Low-Pressure Sodium (LPS) Bulbs.

One of the most energy efficient traditional lighting technologies that have been ever designed is low-pressure sodium lamps. They generate a single color yellow light which is very efficient but it cannot recognize colors.

Since LPS lamps only produce light of a very small spectrum, all items lit out appear in yellow or gray, and it is hard to differentiate the color.

Key Features

• Efficiency: 200 lumens per watt maximum.
• Lifespan: around 18,000 hours
• Monochromatic yellow light

Advantages

• Extremely energy efficient
• Long operational life
• Low light pollution in the astronomical regions.

Disadvantages

• Almost no color rendering
• Big size of lamps and heavy fixtures.
• Poor usages in contemporary cities.

Best Applications

• Tunnels
• Remote highways
• Regions around the astronomical observatories

LPS lamps have faded quickly out of the modern urban lighting systems because of their poor colour rendering.

4. Metal Halide (MH) Street Lights.

Metal halide lamps have been invented as a better version of sodium lighting technologies. They emit a bright white light that is much like daylight and has a far superior color rendering of that of HPS lamps.

Due to their brightness and clarity of light, metal halide lamps have found a wide application in stadiums, parking lots and commercial places where precise color perception is paramount.

Key Features

• Lifespan: 15,000–20,000 hours
• Color Rendering Index (CRI): 60–90
• Bright white light output

Advantages

• Bright and extensive coverage of illumination.
• More realistic color than sodium lamps.
• Appropriate in the large outdoors.

Disadvantages

• Less energy saving than LED.
• Shorter lifespan
• Takes time before it comes into full brightness.

Best Applications

• Sports stadiums
• Commercial districts
• Parking lots
• Public plazas

Although the metal halide lamps have some advantages in terms of performance, they are also slowly being phased out by the LED technology because of their maintenance and electricity expenses.

5. Mercury Vapor Street Light bulbs.

Before sodium and LED lighting gained popularity, mercury vapor lamps were very popular in the middle of the 20th century. These lamps are bluish-green lamps that function with an electric arc of vaporized mercury.

Although they used to be seen as effective in comparison with incandescent lamps, today mercury vapor bulbs became mostly outdated because of environmental issues and their low energy efficiency.

Key Features

• Moderate efficiency
• Bluish-green light output
• Long warm-up period

Advantages

• Durable design
• Lasting operation life in comparison with light technologies of early showcasing.

Disadvantages

• Contains hazardous mercury
• Low color rendering
• Inefficiency compared to current options.
• Best Applications

The mercury vapor lamps are seldom set up these days and are normally left in the older lighting systems pending their upgrades.

6. Street Light Systems that use solar power.

Solar street lights are not a form of bulbs but a entire lighting system that has solar panels and rechargeable batteries. The majority of the solar street lights employ the LED lamps.

Such systems are becoming more popular in rural and off-grid regions since connection to electrical infrastructure is not necessary. Solar lighting also saves on electricity expenses and carbon emission.

Key Features

• The electricity is produced during the day by solar panels.
• The energy is collected in batteries to be used during the nights.
• Illumination is offered by LED lamps.

Advantages

• No electricity cost
• Environmentally friendly
• Ideal for remote areas

Disadvantages

• Increased initial cost of installation.
• Performance is sensitive to the conditions of sunlight.

Best Applications

• Rural roads
• Parks and pathways
• Remote communities
• Smart sustainable cities

Major Street Light Bulb Comparison.

Type Efficiency Lifespan Light Color Normal Uses.

• LED Very high 50,000100,000 h White Streets of cities, highways.
• High-Pressure Sodium Moderate 0: 24,000-100 h Yellow-orange Highways, industries.
• Low-Pressure sodium Very high Approximately 18,000 h Yellow Tunnels, observatories.
• Moderate 15,00020,000 h White Stadiums, parking lots, Metallic Halide.
• mercury vapor Low 16, 00024, 000 in 24 h blue-green old installations.

What Is the Best Street Light Bulb?

Simple LED street lights have been regarded as the most suitable of all the existing technologies. They offer high level of energy efficiency, extended duration of life and quality of lighting over traditional lamps. Also, LED systems can have intelligent options like motion sensors, dimming, and remote monitoring.

Nonetheless, there are still applications of the lighting technologies. For example:

• HPS lamps are still applicable in highways and foggy environment.
• Metal halide lamps are used to give intense white light to sports arenas.
• The solar LED systems are also applicable in remote locations where power infrastructure is not supplied.

Conclusion

There has been a great development in the street lighting technology during the last century. Since the beginning of the mercury vapor lamp up to the sodium lighting system, and the latest LED system, all types of light bulbs on the streets have been significant to the development of the urban areas.

The modern LED street lights have taken over the markets because of their ability to save on energy, their longevity and their high level of control. LED and solar street lighting systems will keep on increasing as cities strive to become sustainable and smart in their infrastructure in the next few years.

Knowledge of the variation of light bulb types in the street is useful to enable city planners, engineers and project managers in selecting the most effective and affordable type of lighting to use in their individual applications.