Figure 5.5 - This is an example of what an external
ballast looks like. You might be able to see the
timer on top of it.
LIGHT BANDS
Light can be separated into a spectrum,
which form the colours of the rainbow. Red,
Orange, Yellow, Green, Blue, Indigo, Violet.
Each of these lights mix down to give white
light. Artificial lights, because of their
nature, tend to lean towards a tint of one of
these colours when they mix down to form white
light.
The electro-magnetic spectrum is a term
used in lighting to describe the distribution
of electro-magnetic radiation by reference to
energy. This table roughly gives wavelengths,
