The brightness of a solar lamp is usually related to its wattage (W), but wattage is not the only factor that determines brightness. The brightness of traditional lamps (such as incandescent lamps) can be directly estimated by wattage, but the relationship between brightness and wattage of solar lamps is more complicated because they use LED light sources and are combined with solar power supply systems. Here are the key points:

1. Wattage represents power, but it is not directly equal to brightness

Wattage (W) represents the power of the lamp, that is, the electrical energy consumption per unit time. In theory, the higher the wattage, the greater the energy consumption of the lamp, and the stronger the output light energy may be. However, the actual brightness is determined by the luminous flux (lumens, Im), which depends on the luminous efficiency of the lamp (Im/W) - that is, how much light energy can be converted per watt of electrical energy.

High-efficiency LED: The luminous efficiency of modern LEDs can reach 80-200 Im/W, which is much higher than that of incandescent lamps (about 15 Im/W). For example, if the luminous efficiency of a 10W LED solar light is 100 Im/W, the brightness is 1000 lumens, which is equivalent to the brightness of a traditional 60W incandescent lamp.

Inefficient lamps: If the luminous efficiency is low, the brightness may not be ideal even if the wattage is high.

2. The impact of solar power supply

The brightness of solar lamps is also affected by the efficiency of photovoltaic panels, battery capacity and weather conditions:

When there is sufficient sunlight: the solar panel charging efficiency is high, the lamps can run at full power and the brightness is stable.

Rainy days or winter: Insufficient charging may cause the lamps to reduce brightness and shorten battery life, and even high-wattage lamps may become dim.

Although wattage determines the brightness of the lamp to a certain extent, the brightness of solar street lights is not determined only by wattage. In fact, multiple factors such as power, lumens, and configuration will affect the lighting effect of solar street lights. But it cannot be simply assumed that the higher the wattage, the brighter the brightness. Wattage refers to the energy consumed by the lamp, while brightness is usually measured in lumens. Therefore, when evaluating the brightness of solar lights, lumen is a more critical indicator.

Solar lights with a power of 10-50 watts are both energy-saving and efficient. When choosing, you should decide based on the actual light brightness required and the location.

The following are the wattage recommendations of solar lights for use in places recommended by Solway:

‌20-30W‌: Suitable for low-voltage systems, suitable for general lighting needs.

‌60W‌: Maximum power of 12V systems, suitable for scenes requiring higher brightness.

‌120W‌: Maximum power of 24V systems, suitable for places with high brightness requirements, but the initial investment is higher. Therefore, it depends on the environmental needs to choose the right LED lamp for you.