When we think of energy, it is often in terms of coal, oil and gas. Yet the earth receives as much energy from sunlight in twenty days as it is believed to be stored in this planet’s entire reserves of fossil fuels.

Although the sun releases ninety five percent of its energy as visible light, it also produces infra-red and ultra-violet rays.

Each part of the solar spectrum is associated with a different energy. Within the visible portion of the solar spectrum, for example, red light is at the low-energy end and violet light is at the high-energy end, with fifty percent more energy than red light.

Scientists often think of light as travelling in small packets, called “photons”, rather in the same way that water is transported by passing full buckets along a chain of people. Photons in the invisible ultra-violet region have more energy than those in the visible region. Likewise photons in the infra-red region, which we feel as heat, have less energy than those in the visible region.

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