Semiconductor chip, no filament, no glass bubble, not afraid of vibration, not easy to break, durable lighting time, service life can reach 50,000 hours (ordinary incandescent lamp service life is only 1,000 hours, ordinary energy-saving lamp service life is only 8,000 hours)
The light of health
The light contains no ultraviolet and infrared rays and produces no radiation (ultraviolet and infrared rays are found in ordinary light lines).
Green environmental protection
Free from harmful elements such as mercury and xenon, it is conducive to recycling and utilization, and will not generate electromagnetic interference (mercury and lead are contained in ordinary lamps, and the electronic ballast in energy-saving lamps will generate electromagnetic interference).
Dc drive, no stroboflash (common lamps are ac drive, so stroboflash is inevitable)
High light efficiency
90% of electricity is converted to visible light (80% of the energy of a typical incandescent bulb is converted to heat, and only 20% to light).
Use low voltage dc power supply, more safe and reliable, long service life characteristics, also has anti-theft function, strengthen the safety of lamps and lanterns itself, can be used in dangerous places such as mine.
Low voltage, dc power supply, battery power supply, solar power supply, can be used in remote mountainous areas and outdoor lighting and other short of power, short of power places. Unique LED lamp shade, so that the solar lamps achieve a perfect combination of functional and decorative. Patented battery protection electrical cabin, not only beautiful and generous, but also protect electrical cabin devices from human damage, unique anti-theft function, strengthen the safety of lamps and lanterns itself.
3.The choose and buy
In the design of solar garden lamp, it involves many factors, such as light source, solar cell system and battery charge and discharge control.
The solar courtyard lamp is composed of solar panel, solar charge and discharge controller, solar energy storage battery, load, and lamp shell.
The main function of solar panels is to convert light energy into electricity, a phenomenon known as the photovoltaic effect. There are three kinds of solar cells: monocrystalline silicon solar cell, polycrystalline silicon solar cell and amorphous silicon solar cell. In the eastern and western regions with good sunlight, polycrystalline silicon solar cells are preferred. Because the production process of polycrystalline silicon solar cells is relatively simple, the price is lower than that of monocrystalline silicon cells, and the conversion efficiency has been continuously improved in recent years. It is better to use monocrystalline silicon solar cells in the southern region where there is not enough sunshine in rainy days, because the electrical performance parameters of monocrystalline silicon solar cells are relatively stable. However, amorphous silicon solar cells are better in the case of weak indoor sunlight, because amorphous silicon solar cells have low requirements on solar illumination conditions.
Solar cells have five major electrical performance parameters:
1). Isc is short circuit current
2). Im is the peak current
3). Voc is an open circuit voltage
4). Vm is the peak voltage
5). Pm is the peak power
Note: Pm is peak power = Im is peak current ×Vm is peak voltage.
For a single solar cell, it is a PN junction, which has all the characteristics of a PN junction except that it can generate electricity when sunlight strikes it. Its rated output voltage is 0.48V under standard lighting conditions. Solar cell modules used in solar lighting fixtures are composed of multiple solar cells connected together.
Solar charge and discharge controller
Regardless of the size of solar lamps, a good performance of the charge, discharge control circuit is essential. In order to extend the service life of the battery, the charging and discharging conditions must be limited to prevent the battery from overcharging and deep discharging. In addition, due to the unstable input energy of solar photovoltaic power generation system, the control of battery charging in photovoltaic power generation system is more complex than that of ordinary battery charging. For the design of solar lamps, success and failure often depend on the success and failure of the charge and discharge control circuit. Without a good performance of charge and discharge control circuit, it is impossible to have a good performance of solar lamps. Charge and discharge controller must have the following characteristics:
1). Anti-charge control
2). Over-charge control
3). Anti-overdischarge control
4). Temperature compensation
Solar energy storage battery
As the input energy of solar photovoltaic power generation system is not stable, it is generally necessary to configure battery system to work, solar lamps are no exception, must be configured battery to work. Generally there are lead-acid battery, ni-cd battery, ni-h battery, their capacity choice directly affects the system reliability and system price. The selection of battery capacity should follow the following principles: first of all, under the premise of satisfying night lighting, the energy of solar cell module in the day should be stored as far as possible, and at the same time, it should be able to store the electric energy needed for night lighting to meet the continuous cloudy and rainy days. Battery capacity is too small to meet the needs of night lighting or continuous use; If the battery capacity is too large and the panel cannot provide enough charging current, the battery is often in the state of power loss, which affects the battery life and causes waste at the same time.
Solar lamp products to energy conservation and environmental protection as an advantage, of course, the load to save energy, long life. We generally use LED lamp and 12V dc energy-saving lamp and low pressure sodium lamp.
Most lawn lights choose LED as the light source, LED life is long, can reach more than 100,000 hours, low voltage, very suitable for the application of solar lawn lights.
The courtyard lamp generally adopts LED lamp or 12V dc energy-saving lamp, the voltage of dc energy-saving lamp is dc, no need to invert, convenient and safe.
Street lamps generally use 12V dc energy-saving lamps and low-pressure sodium lamps. Low-pressure sodium lamps have high light efficiency but are relatively expensive, so they are seldom used.
LED lamp housing
Between aesthetics and energy saving, most choose energy saving. Appearance requirement of lamps and lanterns is not very tall, relatively practical go.
To sum up, when choosing the solar energy courtyard lamp suitable for me, besides the energy saving and environmental protection features of the product itself, I should pay attention to the use stability and economy of the product.