White Light is the only source of all types of Energy (The ability to cause a change): thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy. (Proved in Physics). The sun (Surya Dev) is the one and only source of white light in our solar system. Produced artificially, fluorescent light bulbs and white LEDs produce white light.
Other light bulbs, like the incandescent lamp, do not produce white light. They produce light of much longer wavelengths along the yellow to red range. A white Light Source is a Light Source with a broad optical Bandwidth (usually 100 NM or more) (Source: www.google.com)
The law of conservation of energy states that:
"Energy can neither be created nor destroyed but can be converted in form or other."