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law of conservation of energy staes ====> energy cannot be created or destroyed; it can only be converted from one form to another.
Example:
Give a incadesent light bulb and uv light rated at 100 watts. The incadesent bulb uses the energy for both heat (hot bulb) and light. The UV light uses less heat with most of the energy for visible light. That is why the UV is more efficient. The incadesent (regular bilbs) may be good in the winter because it heats up the air a little.
Just for the record I also have a electrical engineering background
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