The energy of the sun is converted in light, which is then converted in heat.
breaks, or no sun
Solar powered lights are lamps with small solar panels mounted on top that recharge a usually triple AAA (not included) Ni-Cad battery. The light is a LED which uses very little juice and in theory...
There is no difference between a light bulb powered by regular power and solar power, the difference is where the power comes from.
That would depend on the size of the panel and the wattage of the light