The key to see the power (the same as the conversion efficiency of the solar battery, that is the size) of the solar cell, and the power of the light source used, batteries. Lawn light with little solar cell is absolutely bad. Generally less than 1.5 watts rated power of the solar cells are tasteless product, no actual value. To see where you want to use, how the solar power system configuration, configuration reasonable that position does not affect you installed it to absorb solar energy, it should not be a problem, now the solar energy-saving technology matures, or good use .