Light Efficiency Analysis of Several Light Sources Commonly Used in Solar Street Lights

There are many configuration schemes for solar street lights, each with its own merits, but the cost is generally high. In order to reduce the cost, the choice of light source is the key. The following is a brief introduction to the classification of common light sources for street lamps: 1. Sodium lamps are the most used, which are characterized by the highest theoretical luminous efficiency, the power may be larger, and the price is in the middle. The disadvantage is that the color rendering is very poor. 2. The second is energy-saving lamps. Tri-color energy-saving lamps are the most cost-effective among gas discharge light sources. Although the theoretical light efficiency is slightly lower than that of sodium lamps, its color rendering is very good, almost close to incandescent lamps ( Color rendering index is defined with incandescent lamps). Although the effective life of energy-saving lamps is not the longest, because of its extensive use, the cost of construction becomes very low. Even for high-quality energy-saving lamps, the cost per watt is only a few cents. This is an advantage unmatched by any other high-efficiency light source. 3. LED light source and electrodeless lamp. Electrodeless lamps have not been widely used due to technical limitations and the cost is not cheap. However, LED is developing rapidly. The energy efficiency ratio of LED street lamp is between sodium lamp and energy-saving lamp. The color rendering can be done very well; if the working state is well controlled, the life can be very long, and theoretically it can reach 100,000 hours, which is an incomparable advantage of any light source. Although LED has many advantages, it also has its limitations. LED's requirements for operating temperature are almost harsh. It is not suitable for high temperature work. Even if it works at room temperature, heat dissipation is a headache. In addition, LEDs also have high requirements for driving voltage. If there is an overvoltage, the light decay of the LED will be very large, and it will even be damaged quickly. In addition, LED chips are restricted by foreign countries, so the price of LED light sources is high, reaching 30 yuan/W, which obviously limits its popularity. Because some solar street light projects are subject to price constraints. Baoding Spectrum Electronics experts recently designed a new solar street light controller with energy-saving lamps as the light source, and the effect is good. The system adopts high frequency inverter with high efficiency, coupled with the unique protection control method of the controller, the performance is very stable. Due to the low price of energy-saving lamps, it is very helpful to reduce the overall cost of street lamps. In addition, energy-saving lamps can be bought everywhere, and future maintenance and replacement are also very convenient.