Photovoltaic cells can only convert specific frequencies of light into electrical energy, meaning not all types of radiation will be effective. A laser can work if its frequency falls within the usable range of the solar panels, but using a laser to power them is inefficient due to energy losses. Incandescent and fluorescent lamps can also power solar panels, as demonstrated by solar-powered calculators that function indoors. Overall, while various light sources can energize solar panels, efficiency and energy input versus output are critical considerations. The discussion highlights the limitations and practical applications of different light sources on solar panel performance.