Light is an electromagnetic wave, just like broadcasting radio. The difference is, light can be seen by human eye. Like matter, light consists of tiny "particles", called photons". Each of them has an energy of 'frequency multiplied by planck's constant'. The reason light is measured in candela and not watts, is an human aspect of measurement. Human eye sees light. Other frequences that the human eye does not catch, are often negligible. The candela refers to the obvious.
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